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...

How do the lights work?

A reader asks: How do the lights work?Answer: Scientists are still investigating the precise mechanism that makes light therapy effective. Thus far,...

I suffer from panic disorder. I used a light box for four days for 30 minutes starting at 6:30 a.m. On the fourth day...

A reader asks: I suffer from panic disorder. I used a light box for four days for 30 minutes starting at...

I used to be a night owl only — I could not fall asleep until 1-2 a.m. and then always had trouble getting up...

A reader asks: I used to be a night owl only -- I could not fall asleep until 1-2 a.m. and...

Why am I so tired in the morning during the winter months?

A reader asks: Why am I so tired in the morning during the winter months?Answer: Our internal biological clock--which strongly influences our...

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...

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...

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....

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...

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...

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