How many minutes do you have to be asleep to start dreaming?
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researchers estimate that people take an average of 7 minutes to fall asleep; however, we should not actually begin dreaming until about an hour and a half later, when we enter the rapid eye movement portion of rest. this is when the actual dreaming starts.

7 minutes

explanation:

it is estimated that people take an average of 7 minutes to fall asleep, but we should not actually begin dreaming until much later during the sleep cycle. about an hour and a half into our slumber experience, we enter rem, or the rapid eye movement portion of rest. this is when the actual dreaming starts.

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