A sleep

How many hours must we sleep each night? A healthy amount of sleep is about 8 hours. I enjoy sleeping all night and some of day too. It's always nice to have a short sleep during the day, but when we are at work this can be a problem. When I am at work I only nap for 15 minutes. It's makes me sprightly.

I'm not one hundred percent sure what you mean by sprightly, but you could mean energized or awake. Usually sprightly is used for older people, too. "Nap" is a verb that means the same thing as "to take a nap" so you could use either one. Great job!