Trees too sleep

Down to Earth - - SCIENCE -

THOUGH SLEEP pat­terns have been stud­ied in small plants, it was not known how big trees sleep. Now, re­searchers have mea­sured the sleep move­ment of fully grown trees us­ing a time se­ries. They found trees droop dur­ing night, which can be seen as a po­si­tion change in leaves and branches. In the morn­ing, the trees re­turned to their orig­i­nal po­si­tion within a few hours. It is not yet clear whether they were wo­ken up by the sun or by their own in­ter­nal rhythm. Frontiers in Plant Science, Fe­bru­ary 29

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