I tried twice to nap, first with the three hour delay and then again when four hours had passed since the previous nap. Both attempts failed and I didn't sleep. I'm going to nap once I get tired and try to re-set my schedule with that with four hour intervals.
I don't feel particularly tired. In fact, I keep feeling great. It's amazing since I haven't have any adaptation phases and I have slept under four hours every day. I just can't wait how great it will be after I adapt.