What is it called when a person goes to bed early in the evening and wakes early in the morning?

The correct term for when a person goes to bed early in the evening and wakes early in the morning is Advanced Sleep Phase Syndrome. This condition is characterized by a natural tendency to fall asleep and rise significantly earlier than the typical sleep schedule. Individuals with this syndrome may find themselves feeling drowsy as early as 6-8 PM and waking up in the early hours of the morning, often feeling well-rested. This can sometimes coincide with older age, as many older adults experience shifts in their circadian rhythm that lead them to prefer earlier sleep and wake times.

In contrast, Delayed Sleep Phase Syndrome is the opposite, where individuals struggle to fall asleep until late at night and subsequently wake up later in the morning. Chronic Insomnia refers to difficulty falling asleep or staying asleep, leading to impaired functioning during the day, without the specific early bedtime or wake time. Nocturnal Sleep Disorder encompasses various sleep disturbances, but doesn't specifically describe a pattern of early sleeping and waking as seen in Advanced Sleep Phase Syndrome.