In some people (e.g. me) it takes the form of wanting to accomplish X before sleep, but being too tired/lazy/... to start, and so procrastinating a little bit,

In some people (e.g. me) it takes the form of wanting to accomplish X before sleep, but being too tired/lazy/... to start, and so procrastinating a little bit, while still intending to do X. Then, as time progresses, I probably become less likely to start on X but I keep doing random stuff (sometimes useful, sometimes not) because some part of me thinks I cannot go to sleep because I haven't accomplished anything... sometimes it even feels like bargaining after the fact, e.g. I decided to do a much less important Y instead of X, to feel like at least something had been done. I've learned that if X isn't working out the best thing to do is to just force yourself to go to bed :)