The Dinner Rule states: no matter how rigid Ian’s sleep schedule may be, the moment Katra and I sit down to eat dinner, he will wake up and start crying. It doesn’t matter what time we eat or how long he has slept, he will immediately wake up and start crying, requiring one of us to go and rescue him.
At this point, I believe it’s possible to wake Ian up remotely, just by sitting down to dinner. We could be across town, in a different state, on the ISS, it wouldn’t matter. We sit down, he wakes up.