My DS was dry in the day and wanted to be dry at night. His pull ups were dry in the morning but when we took them off and just wore pj trousers we would 9 times our of 10 have an accident.
A friends Mum suggested putting him in normal pants and pjs at night time.
It has worked really well. One accident a month tops. I am really pleased and so is DS he is nearly five as he feels like a big boy.