"but most people have the most energy during a period starting a few hours after they wake up and lasting 4 hours"

There's no way this is true. Mentally, you're much slower in the morning than the evening. In fact, for optimal intellectual functioning, your body temperature has to be at its highest, not at its lowest and thus you're most productive in the last 4 hours before going to bed rather than the first after rising. I've had other programmer colleagues confirm this to me: how they feel twice as productive at the end of the day than at the beginning and my own experience is the same.

So your statement is simply the opposite of how reality works or there's more human diversity out there than either of us realizes. :)