This happens to me at least once a month. I think it's a false awakening for me. Ill be in bed and wake up and see a huge spider in my bed or aunts all over the place. I think I wake up for real rite after and I jump up out of bed thinking it's real. Ill search my bed for whatever it was I saw for a good 30 mins while I'm still in that just woke up state and I wont think about the situation rationally. Ill finally go to bed and realize in the morning how dumb I am for thinking it was real. One of the reasons because I wouldn't be able to see any bugs at all because my room is completely dark and just because a spider the size of my fist wouldn't be in my bed. It's really annoying tho and I wish it didn't happen.