I’m a side sleeper and have slept with ear plugs in for nearly the past decade (hard for me to sleep without them now).

I currently use Mack’s ear plugs, but I imagine they are pretty much all the same. Just look for some foam ones. The first couple of times it feels strange, but you get used to it quickly.

My preference: Honeywell Howard Leight Bilsom 303, of which I use the smaller size. Can be purchased in bulk.

i'm a side sleeper who could never use plugs until i found those (not affiliated):

https://www.happyearsearplugs.com

they advertise heavily but for me it's the only ones that dont bother me when im turning at night and they hold forever.