The ending of a book should be cathartic. All the plot threads should be tied up, leaving just a few in the case of series. There should be a sense of closure.
Unfortunately, it doesn’t work that way for me.
It may be the kinds of books I’m attracted to, but I almost always feel wound up when I finish a book. All the emotional tension the plot has been churning up is still there and I’m left feeling restless. After I finished reading The Lewis Man by Peter May last night, it took forever to fall asleep. (I have strange problems, I know.) This means that really thrilling reads can touch off temporary insomnia for me.
The only solution is to stop reading before the end of the book and leave the rest for the next day. But if the book is really good, there’s no way that’s going to happen. I must know what happens next.