Well, I've officially now DNFed at each main ACP distance with this past weekend's ride. Lovely day, lovely course, and 75 miles into a 400k I just was massively sleepy, did not want to ride a bike (didn't even want to coast downhill). I'd ruled out bonking (stopped multiple times for food and could feel the sugar rush), my legs were OK, and the bike was mostly OK (I was dragging a brake for a bit which didn't help but I found it and fixed it). I did feel less good at about the same time the weather went from overcast to mostly sunny/warmer, but it wasn't really that hot, and I was fine hydration/electrolytes wise. I kept pushing on for a while, but once I realized that I was going to blow either the next intermediate control or make it by a few minutes and not be able to sit down for a rest break there, which I'd been counting on, I gave it up.
Then I felt really exhausted and congested on Sunday and Monday, as did my spouse, so I'm retroactively blaming this one on my first post-quarantine/lockdown cold.
In happier news, I and another organizer checked out some needed changes to the course for our next 400k that we're offering and it should, as always, be a fun ride. I will be organizing, not riding, so anyone coming up to Boston for the Boston-Portland-Boston 400k, I'll see you there.