insomnia
"The Tylenol PM worked .... TOO GOOD!  After 20 minutes I would have a great night's sleep.  I have been taking it for years .... then my son told me the new reports about this causing dementia.  I stopped immediately.  The side effects after I stopped have been pretty severe.  I never dreamt that there would be withdrawals from this until I googled it but I have most of the symptoms (except for the shakes and nightmares).... dizzy, light headedness, nausea, unable to sleep.  After all I thought, since I talked to my doctor over and over about them (and he said no problem) and they were over the counter, I was good.  WRONG!  Bad stuff.  Tell everyone you know to stop them."