N.W.
In addition to the Rescue Remedy suggestion, I would also like to add "Sleepytime Tea" by Celestial Seasonings. That herbal tea (which BTW is caffiene free) has knocked me out for the night on several occasions. When my daughter had trouble winding down for the night (I think she was about 3.5 yrs old at the time), I would give her a little tea cup of Sleepytime as a part of her bedtime routine.