WordNet sense 1 (a period of time spent sleeping):

sleep

WordNet sense 2 (the yarn (as in a rug or velvet or corduroy) that stands up from the weave):

pile

WordNet sense 3 (sleeping for a short period of time (usually not in bed)):

catnap, snooze, cat sleep, forty winks, short sleep

WordNet sense 4 (a card game similar to whist; usually played for stakes):

napoleon

WordNet sense 5 (take a siesta):

catch a wink