Hello, I'm toto, I think the quality of sleep is currently 20%, the mattress we use is not ergonomic, causes internal pressure in the spine and when we lie on our side crushes the shoulder and the column is not aligned, but do not worry, soon I will show my friends of steemit my New way of sleeping, more ergonomic, orderly, harmonious, correct, better, and raise the level to 60%, also design another device that increases to 99%, that good that this subject of sleep is in our mind. Greetings.