chinchilla sleeping on side

My chinchilla sometimes sleeps on his side and at first I thought he died! I was worried when this started because usually sleeps in a sitting position. I looked into this and websites mostly said this is normal and he is comfortable but some said he could be sick? He otherwise acts normal so should I assume he is healthy and fine??

I'm a new chinchilla mother so everything he does that I don't recognize makes me nervous! :neener: