Why does labour start at night?

Why is it important to darken the room for a labour? Are candles at a birth just "hippy" or do they help to make birth shorter and more effective?

Evidence for the purple line - Dr Sara Wickham

Hershey, Nestle and Mars broke their pledges to end child labor in chocolate production - Washington Post

Can Labor Start While Sleeping? - The Pregnancy Nurse®

8 Signs That Labor Is 24 to 48 Hours Away

Early signs of labour: what are the first symptoms of labour

Local elections: what does a good night look like for Keir Starmer's Labour or Rishi Sunak's Conservatives?

Study reveals time and day women most likely to give birth

Does Labor Happen More At Night? Here's Why There Are So Many Midnight Hospital Trips

Does Labor Happen More At Night? Here's Why There Are So Many Midnight Hospital Trips