Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:
You need to rest, right? Don't just answer with a "yes," this deserves a "YAASS" (やす)! YAAASSS let's RESSST!!!
I’m resting at home.
You should rest up well when you can, and then work hard when you have to.
The only time that I rest each day is when I’m sitting on the toilet.