Current Schedule: Core Sleep: 10pm-1am Naps: 6:00-6:20am, 11:20-11:40am, 5:40-6pm.
I think my mind is playing tricks on me. I got up once my alarm clock went off, laid in bed for a second to get my bearings, then got out of bed. When I eventually checked my phone to see what time it was, it read 3:26am, despite setting my alarm (and getting up) at 1am. I check some other clocks, but sure enough, it was 3:26. It would seem that my brief pause before getting out of bed was actually over two hours long! This highlights a temptation I had recognized before but not yet experienced till now - if you don't get out of bed immediately, you're liable to fall right back asleep (and not even notice it, apparently). My strategy now will be to stare at my phone from the second I turn it off till I leave the room, just to ensure there isn't any chance of sleepy chicanery wrecking my schedule.
Another thing I've observed is that when my sleep scheduled gets disrupted like this, it tends to snowball into other disruptions. Despite having over two hours of extra sleep, I was still feeling very tired an hour or two later, enough to where I found myself lurching up from a nap I caught myself in while sitting. Again, not helpful for adaptation purposes, so I've also made a new rule not to sit on the couch, wrapped up in a blanket, when I'm feeling sleepy. It's just too cozy (apparently that can be a thing).
Otherwise, I had a good day, was alert and with it during work, and had a fantastic third nap which seemed to stretch on for one or two hours, despite my waking up after 17 minutes. The effect of time dilation is a funny thing to experience firsthand, especially when you see it go in both directions in the same day. The plan now is to implement the safeguards above, and make it through this last segment of adaptation - by golly, I'm going to push through this the best I can. Updated vitals here.