30 min naps

I am so exhausted, last week he was having naps of a hour long, now it’s more 20 min-30 min. Hope it gets better. At night time he’s sleeping through the night from 6-6, some nights he wakes up once to eat. I just dont know how to fix this issue with naps. He sleep with the nested bean sleep sack, white noise on, room really dark 🤦🏻‍♀️ so idk what else to do