Was just at a conference in Las Vegas with a colleague who is the polar opposite.

We've worked together for quite a while and are rarely in the same place, so it was great to see him.

However, we were spending 16+ hours per day together - conference sessions, dinner, drinks, etc.

By the third day I was absolutely exhausted. He, on the other hand, was thoroughly energized...

Luckily, I had two additional days at the conference to enjoy crashing in a suite of my own.