I voted no but don’t usually drink caffeine - also voted yes if I over do it, cuz on the rare occasion where kava is actually strong, I have had nights where it put me in a weird uncomfortable half sleep most of the night.
I feel like different things cause my insomnia. Sometimes it's just me not having discipline because I like the quiet alone time at night, sometimes it's the kava and overdoing it, and the rest it's something else all together.