When you are particularly tired, it means that your own mental pressure is relatively large, or you do not get a better way to release, so you will also have some bad dreams at night, which means that you do think about this kind of thing in your heart.
You can directly in the sleep time must release their mood, think of some happy things, or do some exercise ah, read a book, are able to relieve their own this kind of pressure, and then at night you will have a better sleep.