Insomnia
"I&#039;ve been taking this med - or just the Benadryl, which is the sleep inducing part of Tylenol PM - for several years now, as needed.  It definitely helps me to fall asleep more easily when I might otherwise lay awake for an hour or two.  I did notice that it seems to loose its effectiveness somewhat if I use it too frequently.  I&#039;ve had no noticeable side effects."