From what I've read, CBD has a more stimulating effect than a sedating one. That's generally speaking of course. However, I do have some anecdotal evidence to the contrary. I grew some Z6 x Harle_Tsu F2, and it always makes me tired if I vape it before bed. It could be that there is some THC in it as well. But what I can say is that it definitely DOES have CBD in it, because my ears always ring when I vape anything that is high CBD. It also gives you that floaty CBD body feeling too. One minute, I am thinking about how floaty I am feeling, and next thing I know, my alarm is going off.
I've heard of my friends eating CBD edibles, and then sleeping like a baby for 8 hours too. I'm not sure what the dosages were though. The good thing about vaping is that the onset is a lot faster, and the dosage necessary to have an effect is much less.