Good night

Night or nighttime (also spelled night-time or night time) is the period of ambient darkness from sunset to sunrise during each 24-hour day,when the Sun is below the horizon. The exact time when night begins and ends (equally true with evening) depends on the location and varies throughout the year.When night is considered as a period that which follows evening, it is usually considered to start around 8 pm and to last to about 4 am.Night ends with coming of morning at sunrise.