Medical disclaimer

Everything on circadian.supply is general information. It is not medical advice, diagnosis or treatment, and it does not replace a doctor.

Talk to a doctor before you start bright light therapy or red light therapy if any of these apply to you:

• Bipolar disorder or a history of mania. Bright light can trigger mania.
• An eye or retinal condition, such as macular degeneration, glaucoma or diabetic retinopathy.
• Light-sensitizing medication, such as some antibiotics, retinoids, lithium or St John’s wort.
• Pregnancy.
• Ongoing insomnia, loud snoring, or daytime sleepiness that affects driving or work. These can be signs of a sleep disorder that needs proper assessment.

The calculators on this site give estimates based on population averages from published studies. Your own response may be different.

If you feel unsafe or are in crisis, contact your local emergency number.