Usually, I get so infatuated with a script I'm writing, a new program I discovered, a bug that I need to resolve, a book that I'm reading, some concept that I'm thinking of, that my mind just keeps on being active, and wants to keep working. It's the worst when I'm working on my computer, due to the blue light (I've started wearing yellow sunglasses to minimize the effect), while it's a bit better when I'm reading or listening to music or thinking.
In any case, this is a great article. I feel like small amounts of sleep has been the greatest inhibitor of my performance in... anything really. Being dumb and young I felt like I could still function correctly, but I really started noticing that I had better tournament results when actually sleeping 8 hours, while my results on all other days were lackluster. I read up on a lot of things and convinced myself that sleeping enough is essential. I still slip up and don't even go on my bed at the right times, my sleep schedule goes all over the place for a lot of different reasons, but I'm really trying. I feel like I might need to seek some professional help on this, but I'll still take it as far as possible before that.