The Haunting damaged me forever, I can't sleep without my feet being properly covered now.
That just reminded me of the movie The Unseen. I saw it when I was like 7 years old. I only made it as far as the first killing because I was petrified. The 'thing' comes up from the heating vent and grabs her legs in bed. I still have to sleep with my feet wrapped like in a sleeping bag 25+ years later. I'm sure I would laugh at it now and I can't believe I just found a youtube trailer of it. I might need to hunt it down to finally see the end. A month or so after I saw this I had to stay at my aunts house while my mom was in the hospital. She had those exact heating grates. I didn't sleep the entire week.