I have a set of sleepphones. They are okay. If I sleep on my side with the earphone directly over my ear, it does start to hurt, but just off with the volume a little higher works, depending on the content being played. I've also found they seem to move around a bit inside the head band and the volume varies a lot depending on where the earphone is in relation to my ear. The battery sits on the back on the band which may not be great for back sleepers.
Any particular questions, happy to answer.