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Sleep Cycle, 60 caps

An advanced, all-natural supplement offering a comprehensive approach to promoting healthy sleep patterns.

Sleep Cycle, 60 caps
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70 reviews
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  • Natural Sleep Aid for Supporting Healthy Sleep and Relief of Occasional Sleeplessness
  • Supports Restorative Deep, Slow Wave Sleep (SWS) Cycles
  • Our flagship formulas are modern versions of traditional essence herbs historically used to enhance energy, rejuvenate vitality and improve general health.


SleepCycle is an advanced, all-natural supplement offering a comprehensive approach to maintaining healthy sleep patterns.* SleepCycle achieves this by combining traditional herbal extracts with state-of-the-art modern nutrients for a unique, safe and effective natural sleep formula to aid in controlling restlessness and occasional sleeplessness.*

Age-Related Sleep Problems

One of the biggest problems facing adults is the inability to achieve a deep, restful sleep, and by age 64 about half of all adults report some form of sleeping issue. (1) Age-related sleep issues have been linked to biochemical changes in the body's internal clock that alter the normal response to external light cues (i.e. sunset, sunrise). This results in older people going to sleep earlier in the evening and waking up earlier in the morning. Older sleepers also tend to wake up more frequently during the night, resulting in fragmented sleep.

SleepCycle for a Deeper Night's Sleep

Though people frequently tend to focus on falling asleep quickly, a far better indicator of sleep quality is the ability to wake up feeling refreshed, energized and restored the following day. Consequently, SleepCycle is not intended to act like a fast-acting sleeping pill that knocks people out quickly. Instead, SleepCycle works by gently promoting a state of calm as it initiates the natural process of falling asleep. Over time, SleepCycle conditions and maintains the overall quality of sleep by gradually extending the duration of deep, Slow Wave Sleep (SWS) and shortening the length of time it takes to fall into a restful slumber.

SleepCycle achieves this by combining traditional herbal extracts with state-of-the-art modern nutrients to deliver a unique, safe and highly effective natural sleep aid.

SleepCycle Ingredients

SleepCycle begins with two nutritional compounds, melatonin and 5-HTP, that have been shown to support resynchronization of the body's biological clock to promote healthier sleep rhythms. SleepCycle also contains L-Theanine, an amino acid derived from green tea prized for its ability to maintain calm and relax the mind.

L-Theanine has been shown to regulate psychological and physiological stress responses, support cognitive performance, and relax the mind without inducing drowsiness. In research, L-Theanine intake resulted in a reduction in heart rate (HR) and salivary immunoglobulin A (s-IgA) responses to an acute stress task, which, say study authors, was attributable to an attenuation of sympathetic nervous activation. Thus, it was suggested that the oral intake of L-Theanine could cause such beneficial effects via inhibition of cortical neuron excitation. (2,3)

Melatonin, the hormone produced nocturnally by the pineal gland, serves as a circadian time cue and sleep-anticipating signal in humans. With age, melatonin production declines as the prevalence of sleep issues increases. In one study melatonin was shown to exert significant and clinically meaningful improvements in sleep quality, morning alertness, sleep onset latency and quality of life in patients aged 55 years and over. (4)

5-HTP (5-Hydroxytryptophan)
An extract of the seed of the griffonia plant, 5-HTP is a necessary component for making serotonin in the body. Low levels of 5-HTP are associated with occasional sleeplessness and anxiety. In rats, 5-HTP was shown to alter sleep and brain temperature. (5)

Proprietary Herbal Blend with Wulinshen
(Xylaria Nigripes)

SleepCycle contains a well-known combination of natural plant extracts that have been used for centuries to maintain deep, restful sleep, including Hops, Lemon Balm, Passionflower, Valerian root, Angelica sinensis, Jujube, and Polygala. These healing plants are traditionally endowed with relaxation and sleep-supporting properties.

Tang-Kuei root (Dong Quai, Radix Angelicae Sinensis)
Traditionally used as a sleep aid, Tang-Kuei has been used safely for centuries in traditional Chinese healing.

Hops (Humulus Lupulus)
Hops has been used traditionally as a herbal remedy for sleep issues. Its effects in studies can be attributed to three categories of constituents of lipophilic hops extracts. Though the alpha-bitter acids proved to be the most active constituents, the beta-bitter acids and the hop oil clearly contributed to the activity of lipophilic Humulus extracts. (6)

Lemon Balm (Melissa officinalis)
A novel pharmacological mechanism of action for the anxiety-modulating botanical Melissa officinalis L. (lemon balm) has been reported, and identified as a potent in vitro inhibitor of rat brain GABA transaminase (GABA-T). (7)

Passionflower (Passiflora incarnate)
Passiflora incarnata has been used in sleep-support formulas for many centuries, and administration of oral Passiflora incarnata has been shown to aid in modulating anxiety. (8)

Polygala (Radix Polygalae Tenuifoliae)
Polygala tenuifolia, an herbal ingredient found in traditional Asian sleep formulas, possesses several components, including 4,5-trimethoxycinnamic acid.(9) Study results indicate that the effects of Polygala in stressed animals might relate to its modulating effects on the hypothalamic-pituitary-adrenal (HPA) axis. (10)

Valerian (Valeriana officinalis)
Valerian has an adenosine-like action and supports the readiness to fall asleep. Its action is closely related to endogenous melatonin secretion.(11) In studies, extracts of valerian demonstrate positive effects on sleep structure and sleep perception. (12)

Jujube (Suan Zao Ren, Ziziphus jujuba var. spinosa)
Semen Ziziphus jujube (SZJ), the seeds of Ziziphus jujuba Mill. var. spinosa, is widely used in Chinese traditional culture for sleep and relaxation, with studies showing that it exerts an inhibitory effect on glutamate (Glu) mediated excitatory signal pathways in the hippocampus. (13)

Wulinshen (Xylaria Nigripes)
Wulinshen contains significant amounts of glutamic acid, gamma-aminobutyric acid (GABA) and glutamate decarboxylase. GABA's main function is to inhibit excitatory neuro-activities by exerting a sleep-promoting effect on the central nervous system. Glutamate decarboxylase (GAD) supports the synthesis of GABA, while glutamic acid assists the uptake of GABA to specific brain cell receptors.

Nine known compounds were isolated and identified in Xylaria nigripes for the first time, and their structures were mainly determined by MS and NMR methods. These include (1) 5-hydroxy-7-methoxy-2-methyl-4-chromanone, (2) 5,7-dihydroxy-2-methyl-4-chromanone, (3) 5-hydroxyl-2-methyl-4-chromanone, (4) 1-(2,6-dihydroxyphenyl)-3-hydroxybutanone, (5) 5alpha,8alpha-epidioxyergosta-6,22-dien-3beta-ol, (6) (22E,24R)-ergost-7,22-dien-3beta, 5alpha,6alpha-triol, (7) euphorbol, (8) beta-sitosterol and (9) 2-(4-hydroxyphenyl)-ethanol. (14)

Sleep Loss in Middle Age

In the first study of its kind, sleep researchers at the University of Pittsburgh found that the quality and duration of sleep changed dramatically between the mid-20s and the mid-50s, with subjects going to bed and waking up earlier. The subjects also slept less, woke up more often during the night, and experienced fewer stages of deep sleep. (15)

According to study author, Dr. Julie Carrier, Middle age is a turning point for sleep. Some sleep patterns have already changed significantly by the time an average adult reaches age 30. Dr. Carrier observed that these changes are most likely tied to gradual age-related changes in features of the biological clock.

Research has already shown how disrupted sleep patterns are linked to significant age-related alterations in melatonin, the principal sleep hormone produced by the pineal gland. Melatonin levels are known to drop significantly after childhood and serve as one of the most dramatic markers of biological aging known. By the age of 60, nighttime melatonin production practically ceases, and by age 80, melatonin plasma levels are barely detectable.


SleepCycle is an advanced, all-natural supplement that offers a comprehensive approach to maintaining healthy sleep patterns. Unlike conventional sleeping aids that are designed to just put people to sleep quickly, SleepCycle targets each phase of human sleep with nutrients and plant compounds that have been shown to gently support the quality and duration of deep, restorative sleep, aiding the body in recovering from daily physical and mental stresses.


1. E. J. W. Van Someren., Circadian and sleep disturbances in the elderly, Experimental Gerontology, Vol. 35, Issues 9-10, Dec. 2000, Pages 1229-1237.
2. Kimura K, Ozeki M, Juneja LR, Ohira H. Nagoya., L-Theanine reduces psychological and physiological stress responses, Biol Psychol. 2007 Jan. Pubmed ID: 16930802.
3. Owen GN, Parnell H, De Bruin EA, Rycroft JA. The combined effects of L-theanine and caffeine on cognitive performance and mood, Nutr Neurosci., 2008 Aug. Pubmed ID: 18681988.
4. Wade AG, Ford I, Crawford G, McMahon AD, Nir T, Laudon M, Zisapel N. Efficacy of prolonged release melatonin in patients aged 55-80 years: quality of sleep and next-day alertness outcomes, Curr Med Res Opin. 2007 Oct. Pubmed ID: 17875243.
5. Imeri L, Mancia M, Bianchi S, Opp MR. 5-Hydroxytryptophan, but not L-tryptophan, alters sleep and brain temperature in rats, Neuroscience, 2000. Pubmed ID: 10658624.
6. Schiller H, Forster A, Vonhoff C, Hegger M, Biller A, Winterhoff H., Sedating effects of Humulus lupulus L. extracts, Phytomedicine, 2006 Sept. Pubmed ID: 16860977.
7. Awad R, Muhammad A, Durst T, Trudeau VL, Arnason JT. Bioassay-guided fractionation of lemon balm (Melissa officinalis L.) using an in vitro measure of GABA transaminase activity, Phytother Res. 2009 Aug. Pubmed ID: 19165747.
8. Movafegh A, Alizadeh R, Hajimohamadi F, Esfehani F, Nejatfar M., Preoperative oral Passiflora incarnata regulates anxiety in ambulatory surgery patients: a double-blind, placebo-controlled study, Anesth Analg. 2008 Jun. Pubmed ID: 18499602.
9. Kawashima K, Miyako D, Ishino Y, Makino T, Saito K, Kano Y., Effects of 3,4,5-trimethoxycinnamic acid, an active constituent of roots of Polygala tenuifolia (Onji), Biol Pharm Bull., 2004 Aug. Pubmed ID: 15305046.
10. Sun Y, Xie TT, Wang DX, Liu P. Effect of Polygala tenuifolia Willd YZ-50 on the mRNA expression of brain-derived neurotrophic factor and its receptor TrkB in rats, Nan Fang Yi Ke Da Xue Xue Bao., 2009 Jun. Pubmed ID: 19726361.
11. Brattstrom A. Max Zeller Rohne AG, Romanshorn, Scientific evidence for a fixed extract combination (Ze 91019) from valerian and hops traditionally used as a sleep-inducing aid, Wien Med Wochenschr., 2007. Pubmed ID: 17704989.
12. Donath F, Quispe S, Diefenbach K, Maurer A, Fietze I, Roots I. Critical evaluation of the effect of valerian extract on sleep structure and sleep quality, Pharmacopsychiatry, 2000 Mar. Pubmed ID: 10761819.
13. Zhang M, Ning G, Shou C, Lu Y, Hong D, Zheng X. Inhibitory effect of jujuboside A on glutamate-mediated excitatory signal pathway in hippocampus, Planta Med., 2003 Aug. Pubmed ID: 14531016.
14. Gong QF, Zhang YM, Tan NH, Chen ZH. Chemical constituents in fermented mycelium of Xylaria Nigripes, Zhongguo Zhong Yao Za Zhi. 33(11):1269-72. 2008 June. Pubmed ID: 18831203.
15. University Of Pittsburgh Med. Center. Deterioration Of Sleep During Middle Age Related To Changes In The Biological Clock. Science Daily 25 June 1998.

*These statements have not been evaluated by the FDA.This product is not intended to diagnose, treat, cure or prevent any disease.

* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.


Directions: As a dietary supplement, take two capsules 30 to 60 minutes before retiring.

Not recommended for pregnant or nursing women.


* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.


Supplement Facts
Serving Size: 2
Servings Per Container: 30
Amount Per Serving % Daily Value
L-Theanine250 mg**
Melatonin0.6 mg**
5-HTP50 mg**
Proprietary Blend 750mg **
Dong Quai Root**
Hops Flowers**
Lemon Balm Leaves**
Passionflower Aerial Parts**
Polygala Root (Yuan Zhi)**
Valerian Root**
Xylaria Mycelia (Wu Lin Shen)**
Jujube Fruit (Suan Zao Ren)**
** Daily Value not established

Other Ingredients: Hydroxypropyl methylcellulose, purified water (vegetarian capsules).

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Customer Reviews

Sleep Cycle, 60 caps
Average rating:
4.1 out of 5 Stars

Featured Reviews:

Sleep Cycle, 60 caps
A Miracle Worker
Generally I think of reviews of this type as a list of pros and cons. There are no cons that I can think of so I'll proceed with the discussion of the positive . An elder relative of mine was experiencing extreme disturbance in her sleeping patterns . Her sleep schedule was completely reversed and I have been so for many many years . Needless to say this was problematic for her and everyone around her . I wanted a natural ,holistic product for her and not something that that produce harmful side effects . Well, after just a few months of use her sleeping pattern reversed itself and she now sleeps steadily through the night! Furthermore , if awakened during the night she is now actually able to return to sleep , something that was simply not occurring in years past .I had hopes for sleep cycle as a product but I really hadn't imagined that it would be so successful . Mind you it's not a drug and no one should expect overnight results . It seems to work in a very gentle way in resolving issues of sleeplessness and or disturbance of sleep patterns . So regular and consistent use is the key . At this point I would recommend it to anyone . Many thanks to the people at tango nutrition for getting this product formulated !
Sleep Cycle, 60 caps
Sleep Cycle
I've tried sleep aids from several natural herbal companies, from drops, tinctures, under-tongue sprays and capsules, but have found few that helped me sleep continuously for more than three or four hours at a time. But after a couple of nights of Sleep Cycle, I am able to sleep right through the night for at least seven hours which is a triumph for me.
So, thank you. I'm glad I ordered three bottles to give it a good try after accepting the 2 capsules of Sleep Cycle as a freeby that came with a previous order of other Tango items, and found I slept soundly and woke up feeling light and ready to greet the day with a smile!
Betty in Ottawa, Canada
Sleep Cycle, 60 caps
Mother and Son Pleased with SleepCycle®
Dear John, We learned about SleepCycle in the Alamo Valley Press. The thing that caught our attention was that emergency room workers use it. I bought some for me and my son Malcolm. It seems like I go to sleep faster now. When I wake up I feel more relaxed. And also more wide awake. Malcolm seems to be sleeping better and we ordered more. For Malcolm, getting a good, restful night is something he feels is really important during winter to help the immune system. Most of the people we know work odd shifts. That's why we are telling our family, friends and co-workers about SleepCycle. Phyllis Sparks
Sleep Cycle, 60 caps
Sleep Cycle
I continue using Sleep Cycle even after using other products which
had some side effects. I've noticed that I sleep more soundly and deeper with Sleep Cycle. I have also found that a few days a week, I actually fall asleep without using it as long as I maintain my exercise program, as SC has kept my mind from churning and enables me to sleep well.
Sleep Cycle, 60 caps
It is working ...
The first time I took Sleep Cycle a half-hour before bedtime, as instructed, I slept through the night for the first time in a long time. Now, even when I forget to take it, I still sleep soundly for longer periods, though I only require 5-6 hours to feel great. I don't know if it has a carry-over effect, but either way, it is worth a try.
Reviews Disclaimer: The information contained above is for general consumer understanding and education, and should not be considered or used as a substitute for information contained on or in any product label or packaging, medical advice, diagnosis or treatment. If you are currently taking a prescription drug, consult your doctor before making any changes. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease. Regardless of reviews being positive or negative, customers may have received a discount coupon after submitting their review.


What is the recommended daily dose of Sleep Cycle?

The recommended daily dose of Sleep Cycle is 1-2 capsules, 1 time per day, 1 hour before bedtime.

How much Sleep Cycle can I safely take in a day?

You do not need to take more than 2 capsules in a day to gain the full effectiveness of the Sleep Cycle supplement.

How do I know Sleep Cycle is working for me?

Sleep Cycle is a Tango Advanced Nutrition product that should make a change for you in how you sleep. It should promote your sleep health so that you sleep more deeply and wake up fully rested.

You should expect improvements to occur quickly as many of our customers report dramatic improvement in the first few days of use. The change should be very noticeable. Instead of saying to yourself, "I think this might be helping me", you really should be able to say, "Wow, I feel a lot better."

Usually, very clear results show up in the first month of use for most people.

Do I have to take Sleep Cycle forever?

Everybody has a different set of circumstances that will determine how their sleep will be promoted when using Sleep Cycle. Your response to the supplement will be determined by your individual health circumstances. Issues with sleep may be long-standing over many years. This may determine how soon you notice positive changes and how long you may need or wish to take the formula.

However, the formula is strong enough so that men and women who will get benefits should expect them in the first month of use.

When positive changes in sleep health occur, you can lower your dose to one capsule per night and expect to see continued benefits. The reason for this is that, as with all true health-promoting supplements, Sleep Cycle provides restorative results.

When should I take Sleep Cycle?

The most important consideration in taking Sleep Cycle is to use it daily and consistently. You should take Sleep Cycle about one hour before bedtime.

Can I take Sleep Cycle with other supplements?

Yes, you can take Sleep Cycle with and at the same time as you take other dietary supplements.

I take over-the-counter/prescriptive medicines for better sleep. Can I take Sleep Cycle with them?

You can take Sleep Cycle while you are using other products for your sleep or any other condition. However, you should always take Sleep Cycle or any other supplement at least 2 hours away from any medication to reduce any possible risk of interaction.

If you have any questions about using Sleep Cycle or any other supplement while you are using medications of any type, ask your doctor or pharmacist for advice.

Can I combine Sleep Cycle with some of your other products like Vital Cell?

Yes, you can take Sleep Cycle with Vital Cell or other Tango supplements. Many people find that the addition of Vital Cell promotes their results when taking Sleep Cycle.

You can also call one of our product specialists if you have questions about how best to combine our formulas. The toll-free number for product questions is 1-866-778-2646, ext. 2.

Can a woman take Sleep Cycle if she is pregnant or nursing?

No, we do not recommend that a woman take Sleep Cycle if she is pregnant or nursing. This is not because Sleep Cycle is unsafe but because there have been no safety studies performed on the ingredients in Sleep Cycle for pregnancy and nursing.

Can children take Sleep Cycle?

Sleep Cycle is not recommended for people under the age of 18.

Can I give Sleep Cycle to my pet (cat, dog, or horse)?

We do not recommend that you give Sleep Cycle to your pet as it is not suitable for common pet nutritional concerns.

Is Sleep Cycle tested for contaminants that could harm my health?

Yes, we regularly test batches of our formulas to make sure they meet strict quality control guidelines recommended by government regulatory agencies.

Are there any side effects from taking Sleep Cycle?

Sleep Cycle does not cause drowsiness or make a person sleepy. It also does not contain any stimulants that might cause jitteriness or lack of sleep.

What do I do if I think taking Sleep Cycle is causing me discomfort?

The most common discomforts experienced by a tiny percentage of people when taking any vitamin, mineral, or herbal formula are digestive upset or very mild allergic reactions such as skin itching or irritability.

These minor discomforts usually disappear by taking a lower dose or by taking the supplement with meals.

If you should experience discomfort when taking Sleep Cycle and it does not go away with these suggestions, then discontinue use and contact our product specialist for further recommendations at 1-866-778-2646, ext 2. If we cannot determine a way for you to continue use of the product to gain its benefits, then we will arrange for a full refund for you.

* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
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