Wow, this is hard. One of the hardest things I've done. It's day 5, from when I started, unfortunately I crashed hard on day 3, sleeping through my alarm in the morning for a total of 7 hours. That will set me back, but I'm not sure by how much.
Right now I'm kind of going between really, really lethargic to normal and back again. I'm falling asleep fast during the naps, and I wake up fast too, often 1-2 minutes before the alarm goes off, but I can really tell that my body/mind hasn't adjusted yet.
The suprising thing is the psychological impact. There's no more break between the days, that's the most weird part. Life now feels like one continuous stream, rather than being broken up into a series of days or weeks. The question is then: "What am I going to do right now?" instead of "What am I going to do today?", because without a nightly reboot, time just keeps going. The naps feel more like time outs than proper sleeps, but perhaps when I'm adjusted to them, they'll be a little more concrete. If this is the case, then days, nights, and planning over a period of months is just a mind construct made to prevent us from being as effective as possible. I know that the present moment is the only one we can actually use to make a difference, but now I'm intensly starting to experience it.
The other thing I noticed, like when I was on the raw diet, your mind likes to play tricks on you, test your resolve. Giving you lines like "This could be bad for you!" or "Just sleep for another couple of hours, noone will know." Right now I think the main thing that's keeping me going through all of the lethargy and tiredness is knowing that there's an end, and getting there requires being present and taking it one moment at a time. I know I won't consciously sabotage myself at this point, but lets see what's stronger: my will, or my subconscious.
Also: Yes, if this does get too much, or I break down, I will quit, but I'm nowhere near that point yet. Right now I'm focussing on using all of my will to keep to the schedule and all of my presense to listen to my body. So it's going really well, but it's still hard, as all the best things in life are.