yawn (v): I can't stop yawning - I must be tired.
to open the mouth wide and take a lot of air into the lungs and slowly send it out, usually when tired or bored
nap (n): Grandpa usually has/takes a nap after lunch.
a short sleep, especially during the day
snore (v): Sometimes my husband snores so loudly, it keeps me awake at night.
to breathe in a very noisy way while you are sleeping