 FACT: Mulders waterbed is shown with a  leak spraying water in the air. This might happen if one or more  people were lying on the bed or pressing down on the mattress, but  the fountain continues to spray when he is out of the bed. Waterbed  leaks dont spray so much as ooze. Furthermore, the amount of water  lost to cause the degree of saturation on the carpet (not to mention  leaking into the apartment below) would mean that the bed would have  lost most or all of its water, leaving Mulder waking up lying on the  bottom of the mattress box.