I work in rotating shifts: two days of 7 AM – 3 PM, then

A reader asks: I work in rotating shifts: two days of 7 AM - 3 PM, then two days of 3 PM - 11 PM,...

I get the impression from everything I have read that exposure to light at the time of waking

A reader asks: I get the impression from everything I have read that exposure to light at the time of waking is important for fighting...

My 24-year-old daughter had a kidney transplant three years ago

A reader asks: My 24-year-old daughter had a kidney transplant three years ago and will always be on anti-rejection meds. She cannot be in the...

I started using a 10,000 lux light box last fall with dramatically positive results. …

A reader asks:  I started using a 10,000 lux light box last fall with dramatically positive results. Because I felt better during the winter with...

My MEQ recommended time (Automated Morningness-Eveningness Questionnaire on www.cet.org) for light for chronic non-seasonal depression is 6:30 a.m. I attended a party and did...

A reader asks: My MEQ recommended time (Automated Morningness-Eveningness Questionnaire on www.cet.org) for light for chronic non-seasonal depression is 6:30 a.m. I attended a party...

When you say “optimal timing” of light therapy, what do you mean? What makes the timing “optimal”?

A reader asks:  When you say "optimal timing" of light therapy, what do you mean? What makes the timing "optimal"? Answer: The timing of daily light exposure...

I have always been a “night person.” I have children now and I bear the responsibility of getting them off to school in the...

A reader asks: I have always been a "night person." I have children now and I bear the responsibility of getting them off to school...

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 am confused. A recent q&a item said that color temperature and spectral output matter. I understood your previous answers to suggest they did...

A reader asks: I am confused. A recent Ask the Experts answer said that color temperature and spectral output matter. I understood your previous answers...

I have been tracking my migraines for years. I have clusters that go up in the winter and down in the summer. Jan.-Feb.-Mar.-Apr. are...

A reader asks: I have been tracking my migraines for years. I have clusters that go up in the winter and down in the summer....