(n.) Somnambulism; walking in sleep.

all fours crawl crawling creep creeping gumshoeing night-wandering noctambulation noctambulism noctivagant noctivagation padding prowling pussyfooting scrabble scramble sidling sleepwalk sleepwalking slinking snaking sneaking somnambulant somnambular somnambulism stealing tippytoe tiptoe tiptoeing worming