I don't know about the day/night thing, but we could definitely get used to more gravity. When coming in for landing you could decelerate over the course of the

I don't know about the day/night thing, but we could definitely get used to more gravity. When coming in for landing you could decelerate over the course of the last year or so at a slowly increasing rate to an effect of slightly more gravity than the planet you're landing on. You slowly grow accustomed to that and then when you land, you actually feel lighter on the surface of the planet.