"Morningness-Eveningness" refers to an individual's preference for being active during certain times of the day. People who identify as "morning types" or "larks" tend to feel more alert and productive in the morning, while "evening types" or "owls" often find their peak energy levels in the late afternoon or evening. This preference can influence daily routines, work schedules, and social activities. The concept is linked to the body's internal clock, known as the circadian rhythm, which regulates sleep-wake cycles and other physiological processes. Factors such as genetics, age, and lifestyle can affect a person's morningness-eveningness orientation, impacting overall well-being and performance.