- PHYSIOLOGY: SLEEP
- American Academy of Sleep Medicine
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- American Board of Sleep Medicine
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- American Sleep Research Institute
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- Link List - Narcolepsy
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- Link List - Sleep and Dreams
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- Link List - Sleep - (comprehensive)
- Complete, topical coverage, college level (UCLA)
- Link List - Sleep Disorders
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- Link List - Sleep Paralysis and Hypnogogic States Resources and (links)
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- Link List - SleepNet
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- Narcolepsy Overview
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- National Sleep Foundation
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- Sleep Basics: Comprehensive Online Textbook
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- Sleep Needs, Patterns and Difficulties of Adolescents
- Online textbook of a National Academy of science workshop