I've worn one a couple of times as I have heart problems. Usually I have them on for a few days at a time. I wouldn't say its uncomfortable however it is a bit of a pain in the *** with all the wires and such, I had the electrodes fall off like Lynn during my sleep and I felt a bit constricted/wasn't able to sleep in my usual position which didn't help my sleeping pattern but apart from that there was no issue with it. I hope everything's alright and nothing too sinister.