I get so tired at around this time every night.
"Fine," I say. "I'll just go to sleep and then wake up at a resonable time tomorrow morning. It'll get my schedule back to normal. It'll be awesome."
If I go to sleep now, then I'll suddenly find myself wide awake around midnight, scratching my head and wondering what it was that woke me up so completely.
And then I'll be up until 6:00 or so tomorrow morning.