Does an employer have to notify you of changes to your shift?

Long story short work at a bingo hall doing night shift usually 10pm to 9-10am I have done a shift last night 28-29th and while at work I’ve noticed on the paper rota that my 10pm-9am shift on the 31st has changed to a 9am-10pm shift on the 30th without being told, i physically cannot swap my sleeping pattern that quickly what should I do?