Rolling in crib

My son has always slept so well on his back but we’ve become much more active lately and he’s constantly rolling around. I just woke up and found that he’d rolled onto his stomach in the crib. Made me very nervous so I ran into his nursery and put him back on his back. Now that he’s rolling around at night I’m wondering what works for your LO’s for pajamas? Should I look to take away the sleep sack and just put him in warmer pajamas now that he’s rolling onto his tummy?