i think the sleep you are experiencing is just the 'burn out' you feel after injesting it. did you go to bed immediatly after you vaped, or did you putz around the house for a while? i know that after I injest an indica dominant strain, i feel very sleepy after about 1-2 hours. this is comman with indica strains. i find it hard to fall asleep immediatly after injesting any type of maryjane, it takes an hour or to in order to come down to reach that tired feeling.
i would most definetly not recommend trying to extract cannabinoids from any hemp products. hemp comes from the male plant which has very little or no THC. i remember the legend of a kid who smoked his hemp wallet thinking it would get him high and just getting a headache instead. besides, hemp fibers come from the stalk. the maryjane you are used to vaping comes from the female flower, not the stalk or the leaves.
the same goes for hemp curd from the seeds. the seeds contain no THC either.
i would stick to smoking indica strains a few hours before bedtime. while your high, go on a walk or get some exercise to help you sleep even better.