Do any of you have tips for stopping anxious thoughts so you can actually sleep?

Normally I can fall asleep just fine if someone else is awake at the time and if it's not completely outside but that obviously can't be always the case. My anxious thoughts can be pretty disturbing even though I know they're not true. Like, my brain makes me scared that if I go to sleep I'll end up in a terrible nightmare on loop forever or that I'll be killed(by something not human and most of the time I imagine the stuffed animals on my sister's bed doing it). Also I can't not use my device or have it close because of that second one. Even the slightest noise when this happens puts me on edge because it's either my parents or a demon according to my brain. I'm going to see a psychiatrist in late October for this and other stuff but I reallyyyyy don't want to have to this anymore. I've had similar issues with sleeping for as long as I can remember. It's kinda like an on and off thing, sometimes I can just ignore the thoughts while other times they just keep nagging at me. I know I might seem like a nut job but I really need some advice.