Night time is the period of darkness that occurs after sunset and before sunrise. During this time, the sun is below the horizon, and the sky is often filled with stars and the moon. Many animals, including nocturnal species like owls and bats, are active during the night, while others rest. The temperature usually drops at night, and people often engage in different activities compared to daytime. Night time is associated with sleep for most humans, as the body naturally produces melatonin, a hormone that helps regulate sleep patterns. It is also a time for various cultural events, such as night markets and concerts.