In the morning test, the early birds and the night owls performed nearly the same in their responsiveness. But there was a gap 10.5 hours later: the night owls later showed faster reaction times and were more awake than the early birds.
So basically, whether you get up at 5AM or 9AM, 90 minutes later you’re great. But the 5AM folks are having test #2 at 3:30 in the afternoon when most people are having the mid-day slump, so they didn’t fare so well. The 9AM folks, on the other hand, don’t get test #2 until 7:30, so they test out better. Interesting.
I like the takeaway — work around your own energy levels. Makes sense to me. :)