No one has ever told me I have to answer messages at night, but somehow I always do. A text lands at ten and I'm replying before I've even thought about it, because that's just how things work here. I've never once tested whether the world would end if I waited until morning.
More people experience this than they realize.
You are always reachable after hours even though no one ever actually required it.
If this sounds familiar, the Library can help you find the bigger picture.