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 reading a book 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 boxes used to treat...

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 delayed sleep phase disorder...

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 radio on a timer...

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 this symptom of mono...

I am considering using a light box to adjust my circadian rhythm, which is now severely delayed. …

A reader asks: I am considering using a light box to adjust my circadian rhythm, which is now severely delayed. I live in an apartment...

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 zone for 12 days...

I have suffered from delayed sleep phase syndrome since I was a little girl. I am now 46 and suddenly too old to live...

A reader asks:  I have suffered from delayed sleep phase syndrome since I was a little girl. I am now 46 and suddenly too old...

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 it need to be...

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...