#nighttime__dark  the time after sunset and before sunrise while it is dark outside
  exclusion:  #daytime
  supertype:  #time_period__period__period_of_time  an amount of time; "a time period of 30 years"; "hastened the period of his recovery"
  subtype:  #weeknight  #wedding_night
  part:  #evening  #late-night_hour  #midnight  #small_hours  #lights-out
  part of:  #day__meansolarday__twenty-four_hours__solar_day  time for Earth to make a complete rotation on its axis; "two days later they left"; "they put on two performances every day"; "there are 30,000 passengers per day"
     part of:  #month  a time unit of 30 days; "he was given a month to pay the bill"
        part of:  #year  a period of time occupying a regular part of a calendar year that is used for some particular activity; "a school year"
     part of:  #calendar_month__month  one of the twelve divisions of the calendar year; "he paid the bill last month"

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