Which of the following features is characteristic of Advanced Sleep-Wake Phase Disorder?

Advanced Sleep-Wake Phase Disorder is characterized by a distinct pattern of sleep timing, where individuals experience a significant advance in their sleep-wake cycle. Those affected typically have an earlier sleep onset and wake time compared to the conventional sleep schedule.

The correct response indicates that individuals with this disorder often fall asleep quickly due to their biological clock being set to an earlier time. Consequently, they may find it easier to fall asleep at night, aligning with their advanced circadian rhythm.

While sleeping difficulties can present in various forms, the specific characteristic of Advanced Sleep-Wake Phase Disorder is this tendency to fall asleep rapidly in the earlier evening hours, resulting from the individual’s advanced internal clock. This pinpoints the disorder's nature more accurately than the other options, which are not representative of the disorder's symptoms.