What is the name of this movie?

theres a boy i think his name is thomas (?) and he wears pj's and slippers and when the grandfather clock strikes 12 he goes downstairs and put ones of his slippers in the front door and then he goes to a different world and there is a girl his age there and he spends time with her but then he has to go back to his house and when he goes to bed. SOMEONE HELP ME!!!!!!!