Jack has been mostly coping on 40 minute naps lately. Not on purpose, but hey! He's currently alternating long and short nap days pretty much. If he has a 40 minute nap day, he's fine at night but is tired the next day. As long as I keep him up the next day as well, he'll do a longer nap the next day. If I do an earlier nap to account for him being tired he does a short nap and gets OT. At least I think that's what's going on!