If you and many or all of your family members or friends or roommates have itching all over body, then one of the strong contender for the same can be a disease called Scabies..
it is caused by a mite which stays in superficial layers of skin and lays egg to cause increase in its number in the skin regulraly if not treated.
it can also stay in fomites like bedding, clothes outside the body for 5-7 days and thus transmission can occur by sleeping in same bed as that of affected person.
treatment is simple wherein overnight below chin application of cream is advised but treatment of all contacts is important.
so get yourself checked for that intractable itching which you may be having from many months to rule out SCABIES (Seven Year ITCH)