Thanks for your responses, everyone. They were very helpful.

I did sleep through my medication time at bedtime, so you're probably right -- that really screwed me up.

I'll admit: I'm still kind of screwed up today -- but not as bad...? I slept poorly though because I had so much sleep the night before that I just couldn't manage to sleep for more than a few hours.

Sorry for the delayed reply. Just been screwed up all day and had to expose myself to coronavirus because of idiot politicians. I don't have a mask, so I wasn't wearing one, but everyone else was wearing one, so I'm probably okay...?