There could be all sorts of sounds or noises going on when you are sleeping. One way you may be able to tell is if you wake up during the night for no apparent reason, or waken up in the morning still feeling tired. The best way to tell may be to start recording for noises on a tape, CD, DVD, or another recording device when you lie down with the lights off intending to sleep. You can find sleep noise and sleep recorders on Amazon HERE.