Well, I've been taking benedryl for sleep for at least three years, and I haven't even had a cold for at least three years, only problem is it's extremely easy to develop a tolerance. Diphenhydramine is in almost every over the counter sleep aid, including zzzquil and Nyquil, also unisom. I'm assuming it's in most nightime cold formulas, so they really can't take it off the market without an enormous effort.