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1 vote
Under which stage of sleep are people least responsive to outside stimulation

User Remotec
by
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2 Answers

6 votes
Stages 3 and 4, because the delta waves are present and they are the slowest and the highest amplitude brain waves.
User Caglar
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8.3k points
1 vote
Stage 4 is the deepest stage of sleep in which people are least responsive to outside stimuli. 
User Linschlager
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