Nap for no more than 20 minutes so that you can wake up refreshed and never groggy. for anyone who is sleep-deprived, sleep for a complete ninety-moment cycle, just watch out that it would not hurt your night https://www.facebook.com/econopass/posts/pfbid0AEX1p1FDnrm5AKwdR1sDtkp1mx3yQQ1Naa9JT9FQjQTpYZBoHdgdPaX72Qr52GE4l