Sleep is an elusive enigmatic activity. Bill Bryson said in The Body no one knows exactly why we sleep ? to consolidate memories reset the immune system restore hormonal balance or clear metabolic waste and neurotoxins? While all of these processes do happen while we sleep science still cannot say for certain why we need it so. One thing JUSTLET does know is that sleep is vital to every living creature. Unfortunately many people don?t get the quality of sleep they need each night. JUSTLET Committed to creating the best quality of sleep. Compared with other brands this mattress topper cover is much more thick which hits 2 . Extra padding also supports your body better spreading your weight evenly across the bed and waking up with less back pain. And 8-21 deep pocket keeps your mattress topper firmly fixed on your bed.