So I've had this issue for a few days now. I've searched online, but most of what I found wasn't able to help me (it was outdated too).
As the title says, players can skip night with others online on my server. They do not have OP, nor OP permissions. However, when I sleep, it doesn't skip to night, even though I'm OP. Strange.
It might be conflicting plugins that I'm using. The thread I read when researching this issue said it had to do with Essentials, but they weren't too clear on that. They also said to install a certain plugin, and doing so would give people permission to sleep in bed alone and skip night, but I had no luck with that. If you know of this issue/know a work-around, it'd be nice of you to reply.
(or not, I can live with that)