I've slept with LG Tone headphones as well as Beats X. I'd say the LG Tone was more comfortable to sleep with, since the connection to the neck part is very thin and moves around easily, and the neck part is free to move around loosely as you move. It never seems to get in the way, and the buds aren't ripped out. The BeatsX had a bigger problem with their stiffer neck part, if I moved they'd be pulled from my ears. Plus their at-best 8 hour battery life doesn't always last a full night, so I've been woken up by the sudden lack of white noise.
Then again, when the Tone dies, it screams "LOW BATTERY PLEASE CHARGE NOW" at you over and over again, which might wake you up :)