I got home from work yesterday around 5ish, I'd been sleepier than usual all day, but with good reason; I had some things I wanted to do in the evening so I lay down for a nap at what must have been no later than 5:30 p.m.
At 6:30 p.m. I woke up, and was completely unable to tell if it was morning or night. I wasn't coherent enough to register am/pm on the clock, and I stumbled downstairs to blear at Carol, who reassured me that it was evening - because I certainly wasn't looking forward to dragging myself through the morning routine and off to work.
Betaking myself back upstairs, I briefly contemplated doing anything besides going back to sleep while I was, in actuality, falling back to sleep. Ah, well. Nothing that won't keep until this evening - that's part of why they invented those nifty tin-can things.