Your Ultimate Mattress Guide. There’s a saying, “A good laugh and good sleep are the two best cures for anything.” While keeping a positive outlook in mind is good for our mental health, a good night sleep lets you wake up feeling recharged and revitalized. In fact, sleep is important for optimal health because our body repairs and detoxes during our shut-eyes. Study by the National Sleep Foundation in the US shows that 92% of people agree that a comfortable mattress is important to a good night’s sleep.