Lots of theories, no clear answers. Some folks believe waking up during a certain phase of sleep causes this, which is why alarms and rigid start times in work shifts are toxic to humans. For others it’s dehydration. And no, coffee doesn’t fix that. It may also be an accumulation of sleep hormones and neuroregulators, which you need to pee out by peeing, pooping, washing your body, and drinking lots of water. Kind of like an engine flush.
And yes, there’s also depression and anxiety that interacts with this. Something related to the diurnal cortisol system, which impacts level of alertness when you wake up.
For others it’s a cognitive system, where you believe it’s okay to be a troll in the morning, you hate your job, and those few hours are a free pass to be a dick burglar.
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