Best Kava for Sleep Currently?

[INeedToChill]

With current batches in mind (not the ones that you used years ago), what is the best Kava (including vendor) for sleep? My current one is KWK Boronguru, but it doesn't seem to be as effective as it once was. Thank you! (And thank you to a few people who have already given me great suggestions to start with!)

 

[Zac Imiola (Herbalist)]

Oddly enough I find that if I use new kava regardless of the strain I can possibly have a harder time sleeping. Then it levels out as I keep using it.