Bed bugs and dust mites are attracted to carbon dioxide that humans emit from our skin. They feed on dead human skin cells. People with "A" Type Blood tend to emit a bit different smell than "O" Blood types which is more attractive to bed bugs. While traveling, I bring fabric softener sheets to put under the four corners of mattress under my sheets. 4 to 8 should do the job. Also, my Blood Type "A" friend sleeps ELSEWHERE!