Why is it?

Why is it that on the days I have plans to go somewhere Hudson always takes a good, long nap? Yet on the days where we are just staying home and I'm trying to get work done they only last 30-45 minutes?

My sister and her husband are moving into their new house today so we are heading over there to help unpack once he wakes up from his nap. He's been asleep for one hour and 15 minutes so far! We put him down at 8 at night and never fails he wakes up again at 9:30 every night. But he slept from 10 pm to 4 am last night so that is great progress. Especially considering he was up from 1 am - 5 am the night before. Just up - ready to play, didn't want to sleep. That's the second time this week he has done that and he hasn't done done that since he was a tiny baby! AAAHHH - this child! What can you do?