Well I don’t really put them on a loop. My brain is weird. People normally have like 3 hours of sleep before they enter rem sleep and rem sleep is when we dream. I enter rem sleep immediately upon sleeping. I didn’t know this until I taught myself to lucid dream. Idk why my brain works this way. So whatever I fall asleep to will sometimes play into my dreams. So just creepy videos or movies will do it turn on auto play on YouTube. Like a couple months ago I was watching halloween link- https://youtu.be/AJ21AhULdO4 And my dream was me being chased through the house by a monster. Or I’ll go to sleep to 28 days later. I really like zombie dreams. This is a good movie website though If you want to try https://dopebox.to/home