I can feel a human enter my room because i feel like a pressure wassup up wif dat

Question

but usally nothing is there

Answer 1

You'd notice it with anything, even an animal.  It's a disturbance of the space around you...  you can feel it...  it's not weird.  I even wake up if I am sleeping and my husband comes to my side of the bed...  you feel a change in air pressure...  

Answer 2

are you sure its human? ^_~