I did it a lot as a child but everytime I forced too much to generate things or whatever, I would wake up, ruining my sleep. It was also a good way to remember

I did it a lot as a child but everytime I forced too much to generate things or whatever, I would wake up, ruining my sleep. It was also a good way to remember some things I could not remember awake. Nowadays I can't sleep much so I stopped.