Why do I always wake up at 4 a.m. no matter when I have gone to sleep?

A reader asks:  Why do I always wake up at 4 a.m. no matter when I have gone to sleep? Answer: You have a strong internal circadian...

How many hours a night of sleep does an adult need to stay healthy? Does alcohol help you get a good night’s rest?

A reader asks:  How many hours a night of sleep does an adult need to stay healthy? Does alcohol help you get a good night's...

For all of my adult life (I’m 40), my sleep/wake schedule has been very inconsistent, mostly because I sleep late when I can do...

A reader asks:  For all of my adult life (I'm 40), my sleep/wake schedule has been very inconsistent, mostly because I sleep late when I...

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, earlier and earlier in...

 I’ve noticed that light therapy boxes (LTB’s) have uses for SAD, but I have heard that they can be effective with insomnia.

A reader asks:  I've noticed that light therapy boxes (LTB's) have uses for SAD, but I have heard that they can be effective with insomnia....

I am 50 years old and have struggled with insomnia for decades. I can even remember not being able to fall asleep as early...

A reader asks: I am 50 years old and have struggled with insomnia for decades. I can even remember not being able to fall asleep...

I think I have delayed sleep phase syndrome (DSPS). I took the Automated Morningness-Eveningness Questionnaire and got some interesting suggestions I’d like to try....

A reader asks:  I think I have delayed sleep phase syndrome (DSPS). I took the Automated Morningness-Eveningness Questionnaire and got some interesting suggestions I'd like...

I have a problem with chronic insomnia. I tire later and later each night, then sleep in later and later each morning, until I...

A reader asks:  I have a problem with chronic insomnia. I tire later and later each night, then sleep in later and later each morning,...

Can jet lag cause depression and anxiety? I experienced my first major depressive episode at age 26 and have been wondering whether it was...

A reader asks:  Can jet lag cause depression and anxiety? I experienced my first major depressive episode at age 26 and have been wondering whether...

I’m in the midst of a chronobiologic Catch-22: I need to wake up earlier to use my light box (for depression) and to get...

A reader asks: I'm in the midst of a chronobiologic Catch-22: I need to wake up earlier to use my light box (for depression) and...