I recently moved in with a roommate that has a very weird sleeping schedule. She is more of an owl, wasting her nights and sleeping until noon, and since the flat is very small and the walls are thin, you can imagine the rest.
So, not once did I want to punch her in the face, when in the middle of the night she would do all sorts of loud activities and I had exams the next morning.
But now, with the In-Ear Earplugs, I sleep like a baby. These are earplugs made of a foam material, easy as a feather and are perfectly malleable, taking the shape of your ear without any pain.
They are shipped in packs of 2, they cost $1,05 and are perfect for noisy environments.
I recommend them truly!