Sleeper earrings, in a nutshell, are earrings you can sleep in. In general, sleeper earrings are made in such a manner that they will not slip out or pierce you while you are sleeping.

These are generally tiny hoops with the hoop's end coming back into the earring, resulting in one continuous loop. Sleeper earrings can also have looping ends that make it nearly impossible to wriggle out of in your sleep.

The purpose of having a sleep-friendly earring style is simple: to give you comfort while you are asleep. Also, some people have fears of losing an earring in their sleep and going through the trouble of finding it later. For peace of mind, they wear sleeper hoops.