Morning

Morning is the early part of the day, commonly counted from sunrise until noon or, by clock time, from midnight until noon.

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Circadian rhythm: An internal biological cycle of roughly 24 hours that coordinates sleep, alertness, and other functions. Morning light and regular schedules help synchronize this daily biological timing.
Earth's rotation: Earth's spinning motion around its axis, which produces the daily cycle of daylight and darkness. A location enters daylight as Earth's rotation turns it toward the Sun.
Sleep inertia: A temporary period of grogginess and reduced performance after waking from sleep. It can make the first part of a morning less alert than later hours.
Evening: The later part of the day, typically between afternoon and night. Evening is morning's counterpart in the daily cycle.
Chronotype: A person's characteristic timing of sleep and wakefulness across the day. Chronotype helps explain why morning feels natural to some people and difficult to others.
Sunrise: The daily event when the Sun appears above the horizon at a particular location. Sunrise is the conventional natural boundary that begins morning.
Shift work: Employment organized into work periods outside or across conventional daytime hours. Shift schedules can move waking and work away from the usual morning.
Afternoon: The part of the day from noon until evening. Afternoon follows clock noon, the common boundary of morning.
Morningness-eveningness questionnaire: A questionnaire that estimates a person's preference for activity at earlier or later times of day. It measures individual differences in preference for morning activity.
Solar noon: The moment when the Sun reaches its highest point in the sky at a location. Solar noon provides an astronomical endpoint distinct from clock noon.