noun, する verb
A noon sleep is sleep you do during the day, also known as a nap.
The readings for this word are both kun'yomi readings. You learned them when you learned the kanji, so you should be able to read this on your own.
I'm going to take a little nap.
When I woke up from my nap, it was already past 7 p.m.
Koichi is napping at the moment. Please be seated and wait for a moment.