Nighttime is the period of the day when the sun is below the horizon, resulting in darkness. This time typically begins after sunset and lasts until sunrise. During nighttime, the sky is often filled with stars, and the moon may be visible, providing some light. Many animals, such as owls and bats, are nocturnal, meaning they are active during this time. People often engage in various activities at night, such as sleeping, socializing, or working. Nighttime can also bring cooler temperatures compared to the daytime. In urban areas, artificial lights from buildings and streets illuminate the surroundings, creating a different atmosphere than the natural darkness of rural areas.