COuld be psychological, but phones are known to put out and recieve signals all the time from service towers. Our bodies as humans are wired suprisingly electrical. Small currents being carried from our brain thoughout our bodies. A good way to test this theory out is to remove the battery from the phone and try sleeping with it near you. If you still are having trouble then it could be pyschological. I was told having a laptop on a man's lap can effect sperm count so yes wireless devices can cause changes to our bodies.