Polyphasic Sleep, Day 2
Day 2 would score a 4 out of 5 on the scale of difficulty mentioned earlier. It started off well enough, with just a little sluggishness in the early morning. However, from 4:30am to 11am, I experienced nearly irresistable drowsiness--even when I used walks and activities to try to resist them--to the point where the last couple hours of that time period included two unplanned short naps. The good news is that after the second unplanned nap I was pretty much okay for the rest of the day; as with Day 1, the afternoon and evening were pretty much free of tiredness.
I'm not too concerned about the extreme lethargy and unplanned naps I experienced--it's only the second day of the schedule, and I'm pleased with the fact that the majority of the sleep deprivation has thus far restricted itself to half my day or less. I expect that if I haven't yet experienced the worst of it, I will have by the end of Day 3 or 4, and from that point it's all downhill (i.e. my body's continually improving adaptation will make my naps more and more restorative so that sleep deprivation becomes less and less prevalent).
I do think my situation this morning wasn't helped by the fact that my early and late morning meals (~2am and ~8am, respectively) were both lacking in protein. Incorporating more protein into my early and late morning meals should provide me with additional energy for the first half of my day, making this morning's scenario less likely.