period of time,
time period,
period an amount of time; "a time period of 30 years"; "hastened the period of time of his recovery"; "Picasso's blue period"
weeknight any night of the week except Saturday or Sunday
evening the latter part of the day (the period of decreasing daylight from late afternoon until nightfall); "he enjoyed the evening light across the lake"
Night or nighttime is the period of time when the sun is below the horizon. The opposite of night is day (or "daytime" to distinguish it from "day" as used for a 24-hour period). The start and end times of night vary based on factors such as season, latitude, longitude and timezone.
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Ω
Night The period between sunset and sunrise, when a location faces far away from the sun, thus when the sky is dark.