Center for Environmental Therapeutics



  • Do you have depression or Seasonal Affective Disorder (SAD)?

  • Are you curious or concerned about your circadian rhythm?

  • Are you sleeping the wrong hours?

  • Are you fighting fatigue when you need to be alert?

  • Do you need treatment for your symptoms but don't want to use medications?



  • We're here to help with these and other questions you might have. We offer a variety of services including background information, self-assessment questionnaires, and environmental therapy products. We are a 501(c)(3) nonprofit organization founded in 1994 in response to accelerating international interest in new environmental therapies.


    In the News



    Watch Michael Terman talking about SAD. Aired on Daily Connection with Sarah Haines on February 11th, 2011.

    Download Video: "MP4"


    Listen to Michael Terman's Latest Radio Interview. Aired on Boomer Alley Radio with Marc Sotkin & Sharon Glassman.

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    Dr. Anna Wirz-Justice receives Velux Prize. Basel, Switzerland. CET is thrilled to share the news of this award from the Velux Foundation to Anna Wirz-Justice, our longtime Board member and Director of Chronotherapeutics Consultants. They write: “For the first time, the Velux Foundation, together with the Department of Architecture of the Swiss Federal Institute of Technology, has given this prize for lifetime achievement. With Anna Wirz-Justice, the Velux Foundation is rewarding a scientist who has had sustained impact on the understanding of daylight’s influence on health and wellbeing, as well as the application of light therapy for psychological disorders. As Professor Emeritus, Anna Wirz-Justice is now concentrating on the implications of her biological knowledge of light for the fields of architecture and building design.”



    New York Times: "Enter the Chronotherapists". New York, USA. We were glad to see this ambitious future-look at our field. Olivia Judson writes, "Here’s my prediction for the Next Big Thing in health care: chronotherapy, or therapy by the clock. . . . The implications of all this are huge. Living against your body clock — as so many of us do — can affect your health and well-being in myriad ways. . . . Chronotherapy has [been used] with great success . . . in psychiatry. Several mental disorders, including bipolar disorder, can be rapidly ameliorated by a resetting of the body clock. Indeed, it’s been argued that manipulating the body clock affects the same parts of the brain as antidepressant drugs — but that chronotherapy works faster and with fewer side effects." Read the whole story.


    First U.S. Overnight Chronotherapy Clinic Opens Chicago, October, 2010. A boon for patients with bipolar disorder, the first U.S. clinic offering supervised "triple chronotherapy" (wake therapy, light therapy, sleep phase advance) has opened in Chicago under the directorship of John F. Gottlieb, M.D., in collaboration with CET's Chronotherapeutics Consultants. Referrals from around the country are invited for the several-day protocol. Visit the clinic's website.


    CHRONOTHERAPEUTICS FOR AFFECTIVE DISORDERS - A Clinician's Manual for Light and Wake Therapy

    by Anna Wirz-Justice, Francesco Benedetti & Michael Terman

    Image description This manual introduces chronotherapeutics for depression, a new synthesis of non-pharmacologic interventions designed to accelerate remission in bipolar and unipolar patients alike. It examines the underlying clinical research, explains the involvement of the circadian timing system, and provides hands-on instructions for treating inpatients and outpatients. Written by three of the most prominent experts in the research and clinical applications of chronotherapy, this book enables clinicians to implement its principles and let their patients benefit from its practicality and effectiveness. Read the Reviews in Acta Psychiatrica Scandinavica (English), Journal of Psychiatric Practice (English) or Schweizer Archiv für Neurologie und Psychiatrie (German).



    CET's Mission



    CET's mission is to serve patients, consumers, health care providers and workplace managers to:


  • Educating the public, students and professionals about effective use of environmental therapies.

  • Offering authoritative information on non-medication treatments for seasonal affective disorder, nonseasonal depression and circadian rhythm sleep disorders.

  • Fostering research on environmental interventions that promote alertness, energy, and performance — while combating fatigue, stress, depression and sleep disturbances that affect millions of people.