I find now that when I stay up late, there’s a trough between about 12:30 and 1 when I get really sleepy. I’ll be typing, and find that my eyes are closed and I’m falling asleep– but I don’t necessarily stop typing. If I can remain in a relatively loud, stimulating environment, I can get over it, and push on for another hour or two.

However, if I’m sitting in one my kids’ rooms, like I am now, it’s a lot more of a struggle, anbd I start typiong pretty unreliably.