Whatever the brand, be sure to get the ones for keeping out sound, not water. The best type seems to be the ones you warm up and roll around in your fingers, then squash them into your ears where they expand. Be sure to follow the directions, including tossing them out from time to time and going with fresh ones. And check with your doctor if anything unusual is going on in your ears. Earplugs are handy for places like noisy trains or loud concerts, but don't forget using them for sleep.
Eyeshades are nice too.
I use both now and seem to sleep better, especially in new places. Or for sleeping there's the pillow method, which doubles the earplug power and eliminates the need for eyeshades. Earplugs don't work better than they do because to some extent sound is conducted to the ear from the rest of the head. So for an added bit of quiet and sense of protection when sleeping, I sometimes put a very light feather pillow over my whole head. You just have to remember to take it with you when you turn over.