My goals are to regularize my sleep-wake cycle and treat some mild but persistent depression. At your suggestion, I took your Automated Morningness-Eveningness Questionnaire...

A reader asks: My goals are to regularize my sleep-wake cycle and treat some mild but persistent depression. At your suggestion,...

My 16-year-old daughter is perpetually tired, even though she sleeps well and gets plenty of it. She goes to bed at 9 at night...

A reader asks:  My 16-year-old daughter is perpetually tired, even though she sleeps well and gets plenty of it. She goes...

I bought CET’s recommended light box in early November and can’t even begin to describe what a wonderful addition to my life it has...

A reader asks: I bought CET's recommended light box in early November and can't even begin to describe what a wonderful...

Most of the equipment referred to by your questioners, as well as that sold for depression treatment, uses fluorescent tubes. Have incandescent sources been...

A reader asks: Most of the equipment referred to by your questioners, as well as that sold for depression treatment, uses...

In dawn/dusk simulation therapy, how important is the dusk simulation part? Also, can dusk simulation be successful even if used at different times in...

A reader asks: In dawn/dusk simulation therapy, how important is the dusk simulation part? Also, can dusk simulation be successful even...

I have been suffering from chronic insomnia for several years. I have seen every doctor and tried every medication (both prescription and herb) imaginable...

A reader asks: I have been suffering from chronic insomnia for several years. I have seen every doctor and tried every...

I’m using a light box (10,000 lux) for 30 minutes at 7:30 each morning for depression and to help me get up at a...

A reader asks:  I'm using a light box (10,000 lux) for 30 minutes at 7:30 each morning for depression and to...

I have recurrent ocular herpes for which I take Valtrex every day. Are there any concerns that light box therapy can exacerbate it?

A reader asks: I have recurrent ocular herpes for which I take Valtrex every day. Are there any concerns that light...

There is one brand of light box out there that combines light and ions. Would that be overkill? Could one somehow get “too much...

A reader asks: There is one brand of light box out there that combines light and ions. Would that be overkill?...

In answer to another person’s question, you said, “Waking up to bright morning light, whether from outdoors or timed artificial light sources, is far...

A reader asks: In answer to another person's question, you said, "Waking up to bright morning light, whether from outdoors or...

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