What is the name of this movie?

it started out with a boy in his room at night of course and he called his mom in there to check for monsters and when the mom left the boy heard something coming from under his bed. when he looked under it he was pulled under it it goes into the actual intro of the movie. it was sorta a scary movie you could say.But i would really like to know the name of this movie i really did like it i saw it when i was about 6 or 8 years old, i am 16 now. if you know anything please let me know. Thanks!!

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