I also found CBT-I useful but it doesn't solve the underlying problem (if there is one). For example, if Insomnia is a side effect of depression. Also, for leav

I also found CBT-I useful but it doesn't solve the underlying problem (if there is one). For example, if Insomnia is a side effect of depression. Also, for leaving bed after 20 min if one doesn't fall a sleep. I got this advice as well - go read a book or something. But when I wake up at 4am the last thing I want to do is read a book. I prefer closing my eyes and get some rest / light sleep until my alarm goes off. While it's not sleep it's still restful. Listening to something with headphones helps me.