There's a reason why older people tend to wake up earlier in the mornings — it's a part of the natural aging process. Earlier wake times are part of the natural aging process. And, as a result, wake up fully rested and earlier than the rest of the world. For younger people, melatonin “starts rising after sunset,” Parthasarathy said, which is why you generally feel tired a few hours after. For people with cataracts whose brain thinks sunset was earlier, their perceived sunset is earlier, which makes them tired sooner in the evening.

Source: Huffington Post December 06, 2025 12:15 UTC