Non-REM (NREM) sleep Stages of NREM sleep o stage 1 Falling Sleep - transition state between sleep and wakefulness - eyes begin to roll slightly - consists mostly of theta waves (high amplitude, low frequency (slow) - brief periods of alpha waves, similar to those present while awake - lasts only for a few minutes before moving on to next stage-very short stage, usually occurring a few minutes after bedtime... - brain waves become irregular - the heart rate begins to slow, and muscles relax - easy to awaken and may not realize that he or she has been asleep o stage 2 Deeper...

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REM It is a stage during sleep that is characterized by waves similar to those of beta waves. ... Sleep spindles a brief burst of higher frequency brain wave occurs, means person is truly asleep. K complexes which are low frequency yet higher amplitude waves occur and are in response to arousing stimuli NREM Stage 3 Heart rate, blood pressure and body temp continue to drop and breathing rate continues to be slow and steady Theta and Delta waves (20%-50% are delta waves) Start of the deepest sleep period, generally within an hour of falling asleep It usually lasts for around 10mins Individual...

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• Grade Level: High School