> Biologically delayed relative to what? Relative to humans at others stages of development. > Circadian rhythms have to be cued off some external driver, whe

> Biologically delayed relative to what? Relative to humans at others stages of development. > Circadian rhythms have to be cued off some external driver, whether that's daylight hours, mealtimes or whatever. Yes, and our bodies react differently to those cues depending on our stage of development.