Why do people count sheep when they can't sleep?

This is a psychological suggestion, at the same time, it can also divert your attention. Don't think about those annoying things, and naturally fall asleep.

I am also such a phenomenon. Since I came out to work, sometimes I have insomnia every day. I like counting sheep when I can't sleep. When the number of sheep is almost 100, they feel sleepy and want to sleep. I don't want those trivial things in life and all kinds of annoying things at work.

Mainly a kind of psychotherapy for insomnia.