Calming Collars

[herekittykitty8]

Does anyone have any reccomendations for a calming collar that has a safety breakaway function? The collars have been a lifesaver for me with Marc but I can't put one on him during the time he needs
it the most - my bedtime. He jumps around so much I'm scared he could easily get it caught and strangle himself if unsupervised whIle I'm asleep. I'd feel a bit better of I could
find one w a safety breakaway.
Thanks!!