I am an OP on a bedrock realm and the one player sleep rule seems to be breaking and needing to be reset every day. 

AFAIK the world was created directly onto the realm so no commands etc were entered prior to its creation and only have ever been done on the realm. This is obviously becoming an issue as myself and the realm owner cant be on 24/7 so there are times when someone is afk and then the other players cannot sleep because t just suddenly breaks. 

The times its being reported are between 1 and 4pm UK time, not sure if that has anything to do with it but its a consistent time frame for it to happen.