What Keeps Crew Up All Night?

Growth spurt starvation?
Teething?
Overactive bowels?
Loneliness?

Mandee asked me on Monday how I felt about having Crew sleeping on a different level with a flight of stairs separating us. I replied, "He sleeps through the night without a peep, so it hasn't been a problem at all so far."

I'd like to amend that response...