Start a 30-Day Trial

Sleep and Stress Management

Start a 30-Day Trial


Circadia® is manufactured by Fisher Wallace Laboratories and uses the same technology as the FDA regulated Fisher Wallace Stimulator®. The device manages sleep and stress by comfortably stimulating neurochemical production while lowering cortisol (a stress hormone) and modulating the brain's default mode network, as demonstrated in published studies. When used for 20 minutes before bedtime to manage sleep, and/or 20 minutes during the day to manage stress, the majority of users experience durable results within the first week.

Circadia Reviews

Circadia Reviews

Individual results may vary

"Since I couldn't stop talking about my good mood and hyper-charged focus, my friends stopped laughing and started asking if they could borrow it."

Nina Burleigh, ELLE Magazine

"It's made my life better."

Mike Davis, Vietnam Veteran

"That device reintroduced that feeling of normality to me."

Logan Shield, US Marine (Ret.)

"I have seen very positive results, often within the first two weeks."

Richard Brown, MD, Columbia University

"I'm a strong proponent of making these devices widely available."

Stephen N. Xenakis, MD, US Army (Ret.)

"One of four technologies innovating mental health."

Tori Utley, Forbes Magazine

(Individual results may vary)

Do You Qualify
to Use the Device?

Do you have a medical device implanted in your head or neck?

Do you have a pacemaker?

Are you 21 years of age or older?

Our refund policy allows patients to return their Circadia® device for a refund within 30 days of receipt. Fisher Wallace applies a 15% return fee to cover the cost of device processing, and does not refund the cost of shipping. Refund checks (for 85% of the purchase price) are mailed within five weeks of receipt of an undamaged device.

Powerful Relief,
Yet Comfortable

Circadia® uses prescription-strength brain stimulation technology from Fisher Wallace that is comfortable and easy-to-use. Users typically feel more relaxed within the first 10 minutes of use and achieve rapid sleep and stress management.

On Demand

Circadia® is light and portable and runs on two AA batteries. Use it at home or wherever you travel.

On Demand

Circadia® is light and portable and runs on two AA batteries. Use it at home or wherever you travel.

Trial Period

Try the device for up to 30 days and return it for a refund if you are not completely satisfied. We keep a 10% return fee to cover the cost of testing, disposal and processing, and refund the remainder of the purchase price.

Our Advisory Board

Meir Kryger
Mitchell Rosenthal
Stephen N. Xenakis
Lauri Liskin
J Roberto Trujillo
M.D., Sc.D.
Ronald Podell
Robert Cancro
Sandlin Lowe
Bruce Johnson

Clinical-Grade Technology

Circadia® has been scientifically proven to manage stress and sleep and may be obtained without a prescription. Manufactured by Fisher Wallace Laboratories, Circadia® uses the same technology as the Fisher Wallace Stimulator® and works by comfortably stimulating the brain to produce serotonin and melatonin while lowering cortisol. You may return your device for a refund within 30 days of receipt.

Scientific Evidence

All clinical studies performed with the Fisher Wallace Stimulator® used the same stimulation dosage as Circadia®. Circadia® and the Fisher Wallace Stimulator® are manufactured by Fisher Wallace Laboratories.

Cerebrospinal Fluid And Plasma Neurochemicals Response To Cranial Electrical Stimulation.

Shealy CN, Cady RK, Wilkie RG, et al.
J Neurol Orthop Med Surg 1998;18:94-97. (PubMed link)

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Depression: a diagnostic neurochemical profile & therapy with cranial electrical stimulation (CES).

R.K., Wilkie, R.G., Cox, R.H., Liss, S., Closson, W. The Journal of Neurological & Orthopaedic Medicine & Surgery. Dec 1989. 10(4):319-321.
(PubMed link)

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Gathering Effect

Liss, S, Liss B. Presented at the American Academy of Pain Management Conference Las Vegas, Nevada---September 1999
(PubMed link)

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Physiological and Therapeutic Effects of High Frequency Electrical Pulses.

Liss S, Liss B.
Integr Physiol Behav Sci. 1996 Apr-Jun;31(2):88-95.(PubMed link)

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Alternating low frequency stimulation of medial septal and commissural fibers induces NMDA-dependent, long-lasting potentiation of hippocampal synapses in urethane-anesthetized rats.

Habib D, Dringenberg HC.
Hippocampus. 2009 Mar;19(3):299-307. doi: 10.1002/hipo.20507. (PubMed link)

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Potential and current density distributions of cranial electrotherapy stimulation (CES) in a four-concentric-spheresmodel.

Ferdjallah M, Bostick FX Jr, Barr RE.
IEEE Trans Biomed Eng. 1996 Sep;43(9):939-43. (PubMed link)

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Is Transcranial Electrical Stimulation (TCES) a safe intervention for children with Cerebral Palsy?

Alon, G, Syron S, Smith G
Neurorehabil Neural Repair June 1998 vol. 12 no. 2 65-71

We tested the safety of transcranial electrical stimulation (TCES) applied to seven children (age range 2.5 to 7.5 years) with a confirmed diagnosis of cerebral palsy (CP). Adverse responses were assessed by negative changes in the gross motor function measure test (GMFM), the popliteal angle, and the occurrence of any undesired systemic responses such as seizure, nausea, vomiting, or sleep disruption. The tests first were given before the commencement of a physical therapy exercise (PTE) program combined with a home program of TCES. The tests were repeated after 8 weeks of PTE + TCES and once again after an additional 8 weeks of PT + TCES. One of the 8- week periods involved placebo stimulation in a double-blind design. Stimulator amplitude was 0.5 mA of peak current, phase charge was 0.0166 C, and the averaged RMS current was 249 microamperes. This level was below threshold of sensory nerve excitation, and the child did not perceive the stimulation. Electrodes were placed over the right and left temporal areas of the skull. The stimulation was applied by the parents for 10 minutes, twice a day, 7 days each week. The total goal GMFM scores were greater after both active and placebo stimulation. The popliteal angle improved irrespective of the stimulation intervention. No adverse systemic responses were reported. These results support the hypothesis that TCES as used in this study is a safe procedure.

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Cranial Electrotherapy Stimulation: A Safe Neuromedical Treatment for Anxiety, Depression, or Insomnia

Gilula, Marshall F. MD; Barach, Paul R. MD, MPH
Southern Medical Journal. 2004; Vol. 97(12).

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Cognitive, mood, and electroencephalographic effects of noninvasive cortical stimulation with weak electrical currents.

Tadini L, El-Nazer R, Brunoni AR, Williams J, Carvas M, Boggio P, Priori A, Pascual-Leone A, Fregni F.
J ECT. 2011 Jun;27(2):134-40. doi: 10.1097/YCT.0b013e3181e631a8. (PubMed link)

OBJECTIVES:The use of noninvasive cortical electrical stimulation with weak currents has significantly increased in basic and clinical human studies. Initial, preliminary studies with this technique have shown encouraging results; however, the safety and tolerability of this method of brain stimulation have not been sufficiently explored yet. The purpose of our study was to assess the effects of direct current (DC) and alternating current (AC) stimulation at different intensities in order to measure their effects on cognition, mood, and electroencephalogram.
METHODS:Eighty-two healthy, right-handed subjects received active and sham stimulation in a randomized order. We conducted 164 ninety-minute sessions of electrical stimulation in 4 different protocols to assess safety of (1) anodal DC of the dorsolateral prefrontal cortex (DLPFC); (2) cathodal DC of the DLPFC; (3) intermittent anodal DC of the DLPFC and; (4) AC on the zygomatic process. We used weak currents of 1 to 2 mA (for DC experiments) or 0.1 to 0.2 mA (for AC experiment).
RESULTS: We found no significant changes in electroencephalogram, cognition, mood, and pain between groups and a low prevalence of mild adverse effects (0.11% and 0.08% in the active and sham stimulation groups, respectively), mainly, sleepiness and mild headache that were equally distributed between groups.
CONCLUSIONS: Here, we show no neurophysiological or behavioral signs that transcranial DC stimulation or AC stimulation with weak currents induce deleterious changes when comparing active and sham groups. This study provides therefore additional information for researchers and ethics committees, adding important results to the safety pool of studies assessing the effects of cortical stimulation using weak electrical currents. Further studies in patients with neuropsychiatric disorders are warranted.

Open PDF

Product Reviews

A Real Patient: Mike

Refunds and Repairs

Refund Policy

To initiate a return for a refund, please visit this page.


If you are having difficulty using your device, please read the troubleshooting section of the instructional manual, where you will find solutions for the most common problems. If you still need help, please call us at 800.692.4380. If we cannot solve your problem over the phone, we will repair or replace your device at no charge, so long as it is still under warranty.

Frequently Asked Questions

Is there anyone who should not use CIRCADIA®?

The only patients who are not qualified to use our device are those with implanted medical devices, such as an implanted nerve stimulator or pacemaker, as CIRCADIA® may interfere with the functioning of such devices.

The device is contraindicated for use on the body in patients who have demand or sensing type cardiac pacemakers. This device should not be used around the Carotid sinus. Patients with known or suspected heart disease should not be stimulated. Patients who react poorly to the idea of electrical stimulation of any kind should not use this device. Patients whose skin is irritated around either electrode site should discontinue use of this device.

Are there any potential side effects of using CIRCADIA®?

Less than 1% of CIRCADIA® users may experience a temporary headache, dizziness or skin irritation at the electrode sites. CIRCADIA® may be used safely in conjunction with any medication.

How does CIRCADIA® work?

CIRCADIA® works by comfortably stimulating the brain to produce serotonin, endorphins and melatonin while lowering the stress hormone cortisol, as demonstrated in published studies. A 60-subject study published in 1999 also demonstrated improved focus and concentration after low dose alternating current stimulation, and a 2012 study determined that low dose alternating current dampens the brain's Default Mode Network (DMN) which is active during periods of stress. Access our research Dropbox.

What's the difference between CIRCADIA® and the Fisher Wallace Stimulator®?

CIRCADIA® and the Fisher Wallace Stimulator® are identical technologically, but CIRCADIA® is defined as a general wellness device because it is intended to help people manage sleep and stress. CIRCADIA® is not intended to treat medical conditions. The Fisher Wallace Stimulator® is defined as a medical device because it is indicated to treat anxiety, insomnia and depression.

What does the stimulation feel like?

Most users will not feel the stimulation, while some may feel a mild tingling at the sponge electrode sites. Users typically feel more relaxed after the first 10 minutes of stimulation, as a result of neurotransmitter production.

CIRCADIA® is powered by two AA batteries which typically last for six months of daily usage.

Based on over 10 years of patient monitoring and reporting associated with the Fisher Wallace Stimulator® (from which CIRCADIA® is technologically cloned), there are no long-term negative effects of using our technology.

We recommend using CIRCADIA® every day for the first 30 days. You may then continue on a daily basis, maintenance basis (3-4 times per week) or on an as-needed basis. There are no negative effects associated with abruptly ceasing its use.

Most users will feel more relaxed after 10 minutes of stimulation and will experience durable results after the first two weeks of daily use.

WebMD lists the following signs of stress:

  • Becoming easily agitated, frustrated and moody
  • Feeling overwhelmed, like you are losing control or need to take control
  • Having difficulty relaxing and quieting your mind
  • Feeling bad about yourself (low self-esteem), lonely, worthless and depressed
  • Avoiding others
  • Low energy
  • Headaches
  • Upset stomach
  • Aches, pains, and tense muscles
  • Chest pain and rapid heartbeat
  • Insomnia
  • Frequent colds and infections
  • Loss of sexual desire and/or ability
  • Nervousness and shaking, ringing in the ear
  • Cold or sweaty hands and feet
  • Excess sweating
  • Dry mouth and difficulty swallowing
  • Clenched jaw and grinding teeth

Have more questions? Please let us know.