Your question about amber and insomnia (for plants that actually have amber) - the more amber, the better it should be for insomnia. For me, it doesn't matter though. Even the raciest weed helps me sleep - I just have to wait a little longer.
so you said "for plants that actually have amber", does this mean some plants definitively do not develop amber trichomes at any point? Just asking because I seem to be a bit more sensitive. If I use a sativa leaning strain (talking cannabinoids not strain as is traditional) then I am unable to fall asleep for a good amount of time. That's why I'm trying to nail the harvest time.