Sweating is one of the most popular symptoms of withdrawal, and one of the messiest. The silver lining to this one is that it is over pretty quickly, if you can get through the first few nights.
Many have to change their bedding or pajamas more than once per night while going through withdrawals from opiates, and some find great success in laying around with a fan. Even during the day you may find yourself sweating, often uncontrollably.
Keep an eye on your water intake for the day/s where you are experiencing this sweating, as you can rapidly become dehydrated. Many who have the financial means to afford at home IV services can get through this troubling symptom the fastest, but having a constant supply of fluids until the sweating subsides.