About twenty minutes into playing for the first time, I got really bad motion sickness. I've watched DH and DS play with no problems, but when I started my own game... BLERGH! 
I wasn't even walking (bobbing) around or anything, just building a house. I think it must be the repetition of the blocks and the "4D" movement. I can't play CoD or those kinds of games either because of it.
Anyone else suffer from this? Any tips?
Think I might just stick to Yoshi's Woolly World and ACNL!