I have sleep issues anyway- psychologically, I consider sleep a huge waste of time, even though intellectually, I know why I need it, and physically, I will pay dearly if I don't get it.
None of this matters, because I just can't sometimes, too much nic or not, and it's been a problem for me since I was a toddler. I do know this- vaping higher nic in the morning helps me deal with it. It helps keep the brain fog from settling in, it helps keep me from verbally abusing morning people, it helps me focus on getting what needs doing done until I can grab a nap later.
I've been trying to cut my nic down anyway because I vape a lot lately, and I don't like the head rush, but in the mornings, I might always need a little extra. Everybody else gets coffee to wake them up, which I cannot have, so I think I deserve it.