My friends seem to think so. I am talking about Tylonel PM, or any other sleeping pill. Usually just Tylonel PM though. I take them everynight and have for the past 3 years. I have a horrible case of insomnia, and I rely on sleeping pills to go to sleep every night. There have been a few times where I didn't have my pills for whatever reason, and I stayed up the whole night, just laying in bed thinking, until it was time for work the next morning. It isn't like I crave them or anything...they just make me go to sleep is all. Is there something wrong with this or should I be worried?