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