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Treatment and Care for Sleep Disorders
What are 4 Stages of sleep

Sleep is essential to maintaining normal levels of cognitive skills such as speech, memory, and flexible thinking. Sleep plays a significant role in brain development.

Every 60-100 minutes we go through a cycle of four stages of sleep before entering dream sleep
• Stage 1 is a drowsy, relaxed state between being awake and sleeping
• Stage 2 is a period of light sleep where heart rate slows and body temperature decreases, getting ready for deep sleep
• Stage 3 and Stage 4, or deep sleep are hard to wake up from because there is the lowest amount of activity in your brain and body
• After deep sleep, we go back to Stage 2 and then enter dream sleep - also called REM (rapid eye movement) sleep

Shahriar Shahzeidi, M.D. FAAP, FCCP, FAASM
Medical Director
Fellow of the College of Chest Physicians
Fellow of the American Academy of Pediatrics
Fellow of the American Academy of Sleep Medicine
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Related Links
• National Sleep Foundation - Website
• American Academy of Sleep Medicine - Website
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