I'm totally with Hal on this one. If the weather is decent, why not hike the trail during mostly daylight hours, when you can actually see many of its beauties? Not to mention get a decent night's sleep. My body just doesn't seem to like strenuous exercise at 3. a.m., unless it's dancing in a nightclub
I took advantage of the cool temps on Saturday too and trudged my way up to 4300 (getting there in my usual 'majestic' time of 3.15.) As I toiled s-l-o-w-l-y upwards, at around 10.30 a.m. on the shady slope, I ran across no fewer than three out-of-town folks who were self-rescuing--i.e. descending--from an attempt at a full Skyline/C2C after discovering halfway up that their quads and lungs weren't up to the task. While chagrined, none suffered any effects beyond brusied egos and sore legs.
Now, wonder what would have happened to them had the temps been the normal 102?

Q: How many therapists does it take to screw in a light bulb? A: Only one, but the light bulb has to want to change ...