A lot of people don't understand how important is sleep hygiene. I didn't know how many parasites and bacteria live in our mattresses, pillows, and blankets. My friend is PoliceMan. He is like a detective. Once he was at my home and we were speaking about hygiene. He was saying that the place where we sleep is very dirty and we need to change once in five years the mattress, blankets, and pillow. I said that this is absurd because all we need is to wash them often. He went to his car and got a special UltraViolet hand lamp. I was shocked at how dirty it was.