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...

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...

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...

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...

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...

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...

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...

I am a 22-year-old female who has had chronic fatigue syndrome (CFS) for almost two years. During that time, my sleep has been awful....

A reader asks:  I am a 22-year-old female who has had chronic fatigue syndrome (CFS) for almost two years. During that...

Can light therapy alter endocrine hormone levels? There may be some evidence that TSH levels can be affected, but what about prolactin?

A reader asks:  Can light therapy alter endocrine hormone levels? There may be some evidence that TSH levels can be affected,...

Does seasonal affective disorder subside in more temperate climates?

A reader asks: Does seasonal affective disorder subside in more temperate climates?  Answer: Although exceptions to the rule have been reported in some surveys, in general, Seasonal...

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