The light phase-response curve

Timed before your body-temperature low or after it, the same bright pulse lands your clock 5.02 hours apart, and under 3 lux nothing moves at all.

Also called PRC

Who it's forAny man who can't get to sleep at night and can't get up in the morning.

The item

Three squares: proven in human trials. Two: a strong signal. One: early human data. Striped: the trials disagree.

Emergency: call 911.

I am not a doctor. This is not medical advice. This is self-education. Talk to a physician who has your history before you change anything.