This one won't put you to sleep.
I will confess, though – I enjoyed the "dream world" just a bit more. There are two reasons behind this. First off, as you visit this world, you'll see Luigi's face on the touch-screen below. As he snores, you can actually manipulate things on his face to make things happen in the "dream world," such as wind gusts when you make him sneeze. It's a fantastic tactic that works to varying degrees, depending on what all you can do.
The second is the overabundance of Luigis in his "dream world". He can replicate there – just like any egomaniac would, heh – and you can use multiples to help you out, whether it's forming a ladder or rolling around in a big Katamari-like Luigi ball, running over everything in sight. It's nice to see Luigi get such exposure, while at the same time presenting a fun new gameplay mechanic that really works.
There's also a really cool sequence where you have to turn your 3DS sideways to take part in a massive battle between a robot and, well, a large-sized Luigi, of course. It's really something, though the gameplay really works best in its normal set-up. Still, it's worth checking out.
