The term 'WHAT THE SANDMAN CAUSES' can be summarized as 'sleep', which is a five letter word. Sleep is a natural, recurring state of mind and body, characterized by altered consciousness, relatively inhibited sensory activity, reduced muscle activity and inhibition of nearly all voluntary muscles during rapid eye movement (REM) sleep, and reduced interactions with surroundings. It is a state of rest that typically recurs for several hours every night, in which the brain and other bodily functions slow down and become relatively inactive.