Have you considered the possibility that you don't in fact need it tomorrow? Like maybe if someone is bothering you for something that you need tomorrow, maybe you fucked up somewhere and you should pay the penalty for it instead of expecting a coworker to reply to a message while they not working.
If I need to relay something important and where email could cause broken communication, I need to work after hours.
East Coast in five hours behind of me. West Coast is eight.
If we have the regulators chasing us upon an urgent thing you need to be have the information ready for the next day.
Unfortunately the whole "don't email after work" can only be applied to roles where staff are all within the reasonable timezone.