there are severeal moments during the night where you sleep less sound than during other moments of the night …
if your alarm goes off during a phase where you are in a really deep sleep then it can feel awful
if your alarm goes off during a phase where you are in a light sleep then it can feel refreshing to get up
apart from that there’s also the possibility of the sleep quality being better due to other reasons … maybe on some day you didn’t dring caffeine so you slept better even if you didn’t sleep for that long
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