If I wake up later than my ideal time on the weekend, should I still use the light therapy lamp for the same amount...

A reader asks: If I wake up later than my ideal time on the weekend, should I still use the light therapy lamp...

Can I use a light box while lying on my stomach?

A reader asks: My ideal position for light therapy, as I am waking up, would be to use the lamp while...

Should use of a proper light box raise my vitamin D level to a significantly higher level?

A reader asks: Should use of a proper light box raise my vitamin D level to a significantly higher level? Answer: No, light...

What is Delayed Sleep Phase Syndrome (DSPS)?

A reader asks: What is Delayed Sleep Phase Syndrome (DSPS)? Answer: DSPS is a circadian rhythm disorder in which the internal body clock is synchronized...

I am 34 years old and have a long history of difficulty sleeping. My doctor diagnosed me with delayed sleep phase disorder (DSPD). It...

A reader asks:  I am 34 years old and have a long history of difficulty sleeping. My doctor diagnosed me with...

I am traveling to a time zone that is 12 hours ahead. I will be in that time zone for 12 days (traveling east...

A reader asks:  I am traveling to a time zone that is 12 hours ahead. I will be in that time...

I have just been diagnosed with delayed sleep phase. My body clock tries to make me sleep from 2 a.m. until 10 a.m., but...

A reader asks:  I have just been diagnosed with delayed sleep phase. My body clock tries to make me sleep from...

I suffer from delayed sleep phase syndrome (DSPS) and for years have been using a bright light and radio on a timer to wake...

A reader asks:  I suffer from delayed sleep phase syndrome (DSPS) and for years have been using a bright light and...

Several of my siblings suffered with severe cases of infectious mononucleosis. They all experienced delayed sleep phase, but this symptom of mono seems to...

A reader asks:  Several of my siblings suffered with severe cases of infectious mononucleosis. They all experienced delayed sleep phase, but...

What is delayed sleep phase disorder (DSPD)?

A reader asks:  What is delayed sleep phase disorder (DSPD)? Answer: DSPD is a circadian rhythm disorder in which the internal body clock...