Sure, it is this guy:

antasma_by_neoz7-d6dzua2.jpg

Nah, just joking. Try to do this before you go to bed:

I can recommend you to visualize a bubble of white light around you. Imagine that only positive energy can enter your bubble, only white light. Visualize as well that your energy will flow out from the bubble only at your will. This will help you feel more of yourself and if whatever entity in the astral realm is messing with you, it won't anymore.