Cats Rolling in Valerian Root

That stuff works. I took one earlier tonight. (I'm not ready to go to sleep now, however.) It also works like catnip on cats. Smells horrible, however. From Wikipedia:

Effect on Cats and Rats

An unusual feature of valerian is that the dried root affects the domestic cat in a similar way as [sic] that of catnip. If valerian root is left in a place to which cats have access, they will roll in it, salivate onto it and eat it. Burmese cats are attracted to the dried herb and will deliberately destroy containers to obtain it. However, some cats will not go near valerian root.

Valerian's effect on cats is featured as a clue in two works by Agatha Christie.

Valerian is also very attractive to rats, so much so that it has been used to bait traps. Some versions of the legend of the Pied Piper of Hamelin have him using valerian, as well as his pipes, to attract the rats.