Every Sleep Glitch Explained: Catathrenia Catathrenia is a rare sleep disorder where you groan or make long moaning sounds while exhaling during sleep. It usually happens in the REM stage and can sound like snoring, but breathing stays normal. It’s harmless, though it can disturb partners or roommates. Good sleep hygiene and stress management may help reduce episodes. #sleep #snore #sleepfacts #sleepscience #cool