Can light therapy alter endocrine hormone levels? There may be some evidence that TSH...

Seasonal Affective Disorder

I experience advanced sleep phase syndrome (ASPS) in addition to SAD. My understanding of...

Sleep Phase Advance

I suffer from SAD and was wondering if UV light (from a sunbed) has...

UV Light

How many hours should we sleep at night?

Sleep

How many hours a night of sleep does an adult need to stay healthy?...

Sleep

For all of my adult life (I’m 40), my sleep/wake schedule has been very...

Sleep

I have a problem with chronic insomnia. I tire later and later each night,...

Ask Our Experts

Why do I always wake up at 4 a.m. no matter when I have...

Sleep

How can I determine the optimal number of hours of sleep for me? I...

Sleep

Are there contact lenses available that perform the same function as the blue-blocker glasses...

Sleep & Light
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