I've heard of hypnogogia. I think I've tried it. I've done it when I was little. Right now I only have one voice in my head and she talks all the time. I have other alters who are good and they don't talk. I just read their emotions. I like them and have had them since I was little. I just need to get rid of this one voice. It's taking time and I'm patient. It'll happen. I have faith. Then I'll have my good parts.
I'm sorry you're having trouble. Sometimes music helps with sleep. Sometimes a bath or curling up with a blanket. I'm sorry you're having trouble. I am having trouble too. Hang in there.