You can certainly give it a go, the White Chestnut will slow down his mind constantly ticking over.
I'm not really a fan of the 'prepackaged' remedies (although they still are true Bach Remedies, the Bach Centre does not agree with them packaged that way) - they are supposed to take into account one's individuality, and the RR itself it supposed to be for acute stress/shock and emergencies. It WILL NOT hurt him though.
Give it a whirl - give him 4 drops in the lead up to bedtime, you can even put about 6 in his bath water at night.
Otherwise, I can help you with the custom stuff - just click on my link!
Bookmarks