Is it possible to have a rare case of extreme advance of sleep, which means you get tired, earlier and earlier in the day,...

A reader asks: Is it possible to have a rare case of extreme advance of sleep, which means you get tired,...

Do most people respond to light therapy even at the “right time” for phase advances or delays? Does it need to be done at...

A reader asks:  Do most people respond to light therapy even at the "right time" for phase advances or delays? Does...

Is it true that for society in general, people have a mind of their own by disrespecting or not taking account of their circadian...

A reader asks:  Is it true that for society in general, people have a mind of their own by disrespecting or...