This milk commercial is simply adorable. The message is that drinking milk before bed can help you sleep better. Beyond that, the commercial is preaching a "glass half full" approach to life.
The commercial itself doesn't start with any milk at all. Instead, you see two blindfolded men getting into trucks that look like massive pinatas. They drive into each other in a game of chicken, but both front ends explode with candy as they collide. The entire village runs to the candy and starts grabbing what they can. A little girl picks up a few pieces, but is soon crying after an older boy takes it from her.
However, by the end of the commercial (and the dream) all is well as three men show up with a glass of milk and a piece of birthday cake for the little girl.