Sleepy effect from going longer is from more CBN. More amber trichomes will have the same effect.
CBD is ALL in the strain. Not anything else.
CBD also is something that Ripens Into the bud. From Drying, curing and processing. All these things will have a effect of how much CBD you can squeeze out of a plant. and im sure there is a big variation from Fresh Bud, to bud that has been cured for 6 months.