I am a flight attendant, so my sleep patterns are erratic. My work schedules are also varied — sometimes working early mornings and other...

A reader asks: I am a flight attendant, so my sleep patterns are erratic. My work schedules are also varied -- sometimes working early mornings...

I understand that only a small percentage of the population exhibits symptoms clinically significant enough to be diagnosed as being seasonal affective disorder (SAD)....

A reader asks: I understand that only a small percentage of the population exhibits symptoms clinically significant enough to be diagnosed as being seasonal affective...

If one is sensitive to some fluorescent light — for example, I get migraines — can light boxes be used to treat SAD?

A reader asks:  If one is sensitive to some fluorescent light -- for example, I get migraines -- can light boxes be used to treat...

My 12-year-old son was diagnosed with SAD when he was about eight. He has suffered since he was six, if not younger. I have...

A reader asks:  My 12-year-old son was diagnosed with SAD when he was about eight. He has suffered since he was six, if not younger....

I’ve been using light therapy for SAD for about a month and have found it tremendously helpful for my mood. …

A reader asks:  I've been using light therapy for SAD for about a month and have found it tremendously helpful for my mood. I suffered...

What is the impact of SAD on hormone levels, especially estrogens, prolactin, testosterone and luteinizing hormone? Is it possible that SAD reduces their levels?...

A reader asks: What is the impact of SAD on hormone levels, especially estrogens, prolactin, testosterone and luteinizing hormone? Is it possible that SAD reduces...

I believe I have SAD as I know my body and mind respond favorably during summer months and I get depressed when we lose...

A reader asks:  I believe I have SAD as I know my body and mind respond favorably during summer months and I get depressed when...

Can children under the age of two suffer from SAD? I have a 20-month-old grandson, and since he has been about three months old,...

A reader asks: Can children under the age of two suffer from SAD? I have a 20-month-old grandson, and since he has been about three...

I have at least some degree of depression on a year-round basis with a worsening in the winter months. …

A reader asks:  I have at least some degree of depression on a year-round basis with a worsening in the winter months. In the past,...

Does the changing length of day and the time of natural sunrise/sunset affect the optimum-time calculation for light therapy?

A reader asks:  Does the changing length of day and the time of natural sunrise/sunset affect the optimum-time calculation for light therapy? Answer: Only indirectly. Our internal...