When we sleep, many of the mites feed on dead skin cells and sweat especially bedbugs. However, these small animals of 5 millimeters cause great health problems including: allergies and asthma. In fact, apart from these mentioned diseases, they cause other problems on the human lung. During the night, bedbugs disturb the sleepers; they feed on the blood by pricking the skin. And this sting usually leaves red and sometimes indolent traces.