get it from your library. But actually, if you read it you the #1 point is simply that sleep patterns are not a well understood concept - there is little eviden

get it from your library. But actually, if you read it you the #1 point is simply that sleep patterns are not a well understood concept - there is little evidence to say that any pattern is a good or bad concept. The author sleeps for 6 hours at night and takes a siesta.