I personally love it. I have always been the type of person that likes to take afternnon naps, so for me, its just like taking an 8 hour nap, nothing quite like it. We still have some folks that put aluminum foil on their bedroom windows because they can't sleep with it being bright outside.
Now as far as the energy level goes, oh my goodness you had better wear a watch, more than once I have gone outside to do a little yard work, pick up dog poo, whatever, and one thing leads to another, and BAm its after midnight! Which means I have to get up in like 4 hours for work! lol In my much younger-bar-days, I remember getting a little cranky because the bars would close at their normal time, and I just couldn't get it through my enebriated brain, that they were right, I was wrong, just cuz its light out doesn't mean its early!