It's 1:47am. You've checked the time four times already, each one worse than the last, because now you're doing math on how many hours of sleep you have left if you fall asleep this exact second. You're not thinking about anything important. You're thinking about nothing, and everything, and the meeting at 9am, and why your brain picked tonight of all nights to stay wide open. Tomorrow you'll run on caffeine and willpower. Again.