I think just keep offering I guess. It's probably just his tooth & I've noticed from DS that things change almost daily in that reguard.
Some days he's on every hour or 2, other days only for sleeps, other days he has BF, then doesn't want it for sleep & will just wriggle around on the bed with me til he finally falls asleep.
I think they get too smart & start realising BF puts them to sleep too! Another reason to refuse!!
He will probably be back to normal tomorrow or the next day