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@goatsarah Interesting.

I go through phases of not being able to sleep, and if I get to about 4am I know that's it, there's no chance and I'm going to be awake but in zombie-mode until the next night.

If I drink coffee at that point though, I'll crash inside an hour and sleep until 9 or 10.

Stimulants doing unusual things is pretty strong evidence I reckon.