Describe the phases of a normal sleep cycle.
What will be an ideal response?
Sleep is composed of four different stages and during sleep one repeatedly cycles from one stage to another.
Stage 4 is slow-wave in deep sleep that can be identified by low-frequency high-amplitude EEG delta waves. This
stage occurs more during the beginning of sleep.
Stage 3 is characterized by a lower amplitude but higher frequency EEG wave pattern.
Stage 2 is characterized by an even lower amplitude and even higher frequency EEG wave pattern. This cycle lasts
for longer durations as a typical 8 hour sleep progresses.
Stage 1 is REM: Rapid eye movement is characterized by dreaming and low amplitude high frequency EEG waves.
Most motor neurons (e.g., except eye and breathing motor neurons) are inhibited while dreaming is occurring.
REM occurs for longer time periods during later parts of the sleep cycle. The EEG pattern is most similar to the
alpha pattern found when one is awake.
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What will be an ideal response?
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