You bet they can.yesterday morning,just before daybreak,I was in a deep sleep.something hit me in the back of my head I jumped up and looked around,but there was nobody there.thinking I must have been dreams I went back to sleep.later on in the afternoon,I thought of the experience I had.I began to feel the back of my head,and found a sore spot.I am living alone in my apartment.so it must have been a spirit.G

George,

I really beleive this was an experince within your dream world, they may have been alerting you that something's going on with your neck/back you need to look into.

Their funny little buggers up there you know.

and you know what you can do.