sleep aids

I'm pretty ignorant on the subject of sleep aids, and perhaps I should be thankful about that. Crashing has never been that big of an issue for me. Weird ass dreams, that's another matter.

So I'm watching this commercial for one of them on TV last night and the usual quieter fast talking sentences are running through the end of the commercial when I hear..."side effects can include...blah blah blah...drowsiness..blah blah blah."

Am I missing something? I really thought drowsiness was the general idea.