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

asked Jun 16, 2018 153k views

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6 votes

Stages 3 and 4, because the delta waves are present and they are the slowest and the highest amplitude brain waves.

Caglar answered Jun 17, 2018

6.7k points

1 vote

Stage 4 is the deepest stage of sleep in which people are least responsive to outside stimuli.

Linschlager answered Jun 22, 2018

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