Questions tagged [rapid-eye-movement-rem]

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How does the heart rate change during REM and non-REM stages?

I read different references and I understand that the average heart rate during sleep decreases by some beats per minute. The heart rate is slower in non-REM stage than REM but I found no measurements ...
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Can one learn whilst sleeping? Can one solidify a memory & study for exams by listening to recordings while asleep?

I have ADD (not ADHD) and I am a PhD student so concentration is something that I consistently struggle with on a daily basis. Though I do take medications take medications for adult ADD, I am still ...