This is completely normal. It takes some time for their bodies to digest prey and the general rule of thumb is to leave them alone for at least 48 hours after they have eaten. This generalization, of course, is subject to the husbandry requirements of your bp. A.K.A if you need to clean the cage, by all means move him/her. Just make sure that you support the prey in their belly and you're good to go. After 48-72 hours your little guy should begin to go about his cage movement just like before he ate.