"It is impracticable, however, to keep our sleep free from stimuli; they impinge upon the sleeper from all sides- like the germs of life which Mephistopheles complained- from without and from within and even from parts of his body which are quite unnoticed in waking life. Thus sleep is di...

The research of consciousness, or states of awareness, has provided numerous interesting and influential studies. Sleep, dreams, and hypnosis are states of awareness that have intrigued psychologists because they relate to the quality of psychological interaction with the environment. States of aw...

REM, or rapid eye movement, sleep is a recurring sleep stage during which vivid dreams commonly occur. Also known as the paradoxical stage of sleep, the muscles are relaxed, except for minor twitches, during this phase. Although the muscles of the body are relaxed and considered "temporarily...