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"But they aren't doing anything in the morning as you've just woken up (think of them as a counter of how long you've been awake"

How so? If you wake up sleepy and groggy and all that, then what neuroreceptors are we talking about?

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I would guess they're one of the few lucky people that wake up feeling refreshed and perky in the morning. Me, I feel like zombie usually the first 30-45mins unless I have some caffeine shortly after waking up.

Not at all, I've just realised that waiting for a bit works better than drinking caffeine.

Exercise helps greatly as well.

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