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[+] -8 points 1 year ago* (last edited 1 year ago) (8 children)

The human REM sleep cycle is 90 minutes long. As long as your sleep in multiples of 90 minutes, you'll feel rested. 9 hrs or 6 hours would work but not 10 hours or 30 minutes.

Edit: I meant the entire non-REM and REM sleep stages altogether and not just the specific section of REM.

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  • [–] 7 points 1 year ago* (last edited 1 year ago) (7 children)

    My German Garmin tracks my sleep daily and I’ve never had a REM stage of sleep be 90 minutes.

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  • [–] 4 points 1 year ago (1 child)

    I don't know about your German (har har), but I'm not very confident in what my Garmin or any fitness watch detects on sleep. I got a Garmin to replace my FitBit, wore them both for a while, and saw they didn't have much consensus on sleep data.

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  • [–] 1 point 1 year ago (2 children)

    I don't think this tracking can be that accurate.

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  • [–] 2 points 1 year ago (1 child)

    Well after a cursory look online it seems OP was talking incorrectly.

    Studies show that sleep itself is segmented in 90 minute blocks with REM coming at the end. Rather than the REM section being 90 minutes.

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