What is dark time between dusk and dawn?

The dark time between dusk and dawn is called "night" and typically lasts from approximately 6 pm to 6 am. During this time, the sun is below the horizon and the sky appears dark. The darkness is caused by the absence of sunlight and is deeper in areas without artificial lighting or city lights. Activities during this time are usually limited to those that can be done indoors or with proper lighting. Nighttime is also associated with a decrease in human activity and an increase in nocturnal animal activity.