Sliding mattresses can be really bad for your sleep because they are not as stable as a traditional mattress. This means that you’re more likely to experience pain in your lower back, neck and other parts of your body when you sleep on a sliding mattress. Sliding mattresses can also cause creeping or sliding during the night, which can make it difficult to get comfortable. Finally, if you have heavy people in the bed with you (or if there is any weight beyond what is supportd by the mattress), a sliding mattress could even suddenly become unstable and cause damage.