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British Dictionary definitions for sleep movement

sleep movement

noun
  1. the folding together of leaflets, petals, etc, that occurs at night in certain plants, such as the prayer plant (Maranta leuconura)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012