Mom has alzheimer's, doesn't sleep at night (sleeps often during day).she takes escitalopram in the morning,can we use valerian root capsule at night?

Maybe . . .: But before trying valerian root (http://www.drugs.com/mtm/valerian-root.html), why not try switching her Lexapro (escitalopram) to nighttime dosing. Different people react differently such that some feel sleepy while others complain of insomnia, all as a result of the same medication! Check http://www.drugs.com/mtm/escitalopram.html for more info. More daytime activity such as exercise might help.