People with catathrenia groan in their sleep. It’s a rare condition that’s classified as a sleep-related breathing disorder, similar to obstructive sleep apnea (OSA), though it isn’t usually as ...

Catathrenia, or nocturnal groaning, is a rare sleep condition that causes involuntary moaning while you sleep. A CPAP machine can help control the number of times catathrenia occurs during sleep. You ...

There’s a long list of weird things that can happen when you sleep—think sleepwalking, sleep sex, or even waking up unable to move your body. But as for the noises you make, those are pretty normal, ...