Having to heat up a bottle in the middle of the night has got to be a real pain. I wouldn't know, but I can imagine. The Yoomi self-heating baby bottle makes those late night feeding sessions a bit easier.
The Yoomi has a heating element inside, and to warm it up you just hit a button. In a couple minutes, the milk will be nice and warm. It's not truly self-heating; it needs to be "recharged" in boiling water for 25 minutes. But it retains that energy for use later, which is what makes all the difference.