I definitely second what Deleted User01 said. That is, I bet, that cause of a lot of new people's problems the next day. Kava is quite a strong diuretic and it can catch you off guard so make sure to stay hydrated.
Also, we don't have anyone from N@H participate here, but I'd question if it really is noble or not. For instance, what is the cultivar's name? Does it really come from Vanuatu? It's actually one of the few kavas I haven't had so I can't give you an anecdotal idea of if it's noble or not. You can always e-mail N@H and ask them about it (and if it's from Vanuatu, my understanding is it should have a certificate of approval from the Dpt. of Ag.).
I've certainly never had significant effects the day after drinking what I know to be noble kavas. The only after-effect I notice, which is different from lethargy or drowsiness, is the "shield effect" wherein you feel ever so slightly "immune" to a lot of the external things in our lives that can have a negative impact on us. It's a difficult feeling to describe, but with noble kava (as long as you are hydrated like Deleted User01 said), you shouldn't feel anything that would impair your cognition. (Shit, I don't have any impairment on my cognition even right after drinking kava).