#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 of:  #day
  part:  #evening  the early part of night (from dinner until bedtime) spent in a special way; "an evening at the opera"
  part:  #late-night_hour  the latter part of night
  part:  #midnight  12 o'clock at night; the middle of the night; "young children should not be allowed to stay up until midnight"
  part:  #small_hours  the hours just after midnight
  part:  #lights-out  a prescribed bedtime

No statement uses or specializes #nighttime; click here to add one.