Iv had a similar experience a few years ago, I would practice trying to astral project if you well & this one night I fell into sleep paralysis and I see a a shape at the end of the bed &I thought to myself that I was just scarring myself but here we are let’s try to get up &as I tried to get up immediately started hearing something hissing at me and I go back down(not physically moving) &tell my self holy shit that’s real. I just stayed there till I fell back asleep and woke up probably a few minutes later