8am: at the very top of the range to help you wakeup feeling refreshed (ZRT: 3.7 – 9.5)
11am – noon: in the upper quarter of range, but not quite as high as morning (ZRT: 1.2 – 3.0)
4-5pm: midrange (ZRT: 0.6 – 1.9)
Bedtime: at the very bottom to help you fall asleep (ZRT: .4-1.0)