Becca: maybe there is hidden caffeine you're not aware of? Some chocolate has it, some doesn't. Some orange sodas are caffeine free, some aren't. Kahlua is stuffed with caffeine. Hot peppers or cayenne can keep you awake like caffeine can. Green tea has more than you think. etc.   So you might want to look back over any subtle changes in what you've been taking in?

Bill D: Tylenol is not addictive of course, but you really don't want to take it on a regular basis, it has quite a toxic effect if taken too frequently. Keep it occasional.