^^ I second that. 2000 mg kavalactones put me in a light sleep after lying down after a day working. Waking up a boost of 1500mg did jack shit.
From prior experience the pills do promote sleep somewhat but your better off with an antihistamine. Certainly ain't worth it for any sort of comedown.
Some studies claim effects if you take it on a daily basis. No clue what form its in.