About a week. It is a bad feeling. Your heart rate goes out of normal. I had to go to the hospital to have my sleep monitor by the Doctors. Then, I had to stay over a few nights to take some medications. I was with sleeping pills for a few years. First, my medicine was strong . Then, slowly and gradually the Doctors lower down to nothing. I have no problem with my sleep. Thanks God. I can nap during the day, and at night go to sleep with no help of sleeping pills. I try to eat right, and I exercise every day.