In advanced sleep phase, your body clock (circadian rhythm) is on a schedule hours earlier than most other people’s. You have premature release of the sleep hormone melatonin and shift in body temperature.
…
Are You an 'Extreme Early Bird'?
In advanced sleep phase, your body clock (circadian rhythm) is on a schedule hours earlier than most other people’s. You have premature release of the sleep hormone melatonin and shift in body temperature.
…