Some languages that use the time of day in greeting have a special greeting for morning, such as the English good morning. The appropriate time to use such greetings, such as whether it may be used between midnight and dawn, depends on the culture’s or speaker’s concept of morning.
Morning typically encompasses the (mostly menial) prerequisites for full productivity and life in public, such as bathing, eating a meal such as breakfast, dressing, and so on. It may also include information activities, such as planning the day’s schedule or reading a morning newspaper.
The boundaries of such morning periods are by necessity idiosyncratic, but they are typically considered to have ended on reaching a state of full readiness for the day’s productive activity. For some, the word morning may refer to the period immediately following waking up, irrespective of the current time of day. This modern sense of morning is due largely to the worldwide spread of electricity, and the concomitant independence from natural light sources.
The morning period may be a period of enhanced or reduced energy and productivity. The ability of a person to wake up effectively in the morning may be influenced by a gene called “Period 3”. This gene comes in two forms, a “long” and a “short” variant. It seems to affect the person’s preference for mornings or evenings.