Do you ever, dear reader, just as you're falling asleep, suddenly twitch and wake up? For no reason? I do. It's a terribly common phenomenon; and there is, dear reader, a name for it. It is a myoclonic jerk.
The reason I like myoclonic jerk is not simply that it gives a name to the nameless, but that it sounds like a term of abuse. 'That guy', I can rant, 'is a myoclonic jerk.'
It wouldn't matter that the sentence would be meaningless, because it would sound right.
Incidentally, if you ever experience a myoclonic jerk while you're not falling asleep, you are, in the words of doctor friend of mine, "absolutely fucked".