If you’re a waterbed owner, a good set of waterbed sheets will solve the problem of your bedding riding up over the edges of your mattress at night while you sleep.  These sheets are sewn together at the middle and ends, creating an envelope that holds them in place.  They also have extra-long sides that you can tuck in underneath the mattress for extra security.  Some of them also come with pole pockets that can be secured to your waterbed frame with special posts that serve as anchors on all four corners.  These special features not only give you a better night’s sleep, but they also make changing or making your bed much easier.