Advanced Sleep Phase Disorder (ASPD) is a circadian rhythm sleep disorder characterized by an earlier than normal sleep-wake cycle. Individuals with ASPD typically feel sleepy in the early evening and wake up very early in the morning, often before sunrise. This pattern can lead to difficulties in social and work situations, as it may not align with typical schedules. People with ASPD often struggle to stay awake during evening activities and may find it challenging to maintain a regular social life. Treatment options may include light therapy and behavioral strategies to help adjust the sleep-wake cycle to a more conventional schedule.