每一种动物都需要一定的睡眠时间,那么植物呢?After a long day,do trees fall asleep?It depends on what“sleep”means toyou,but trees do relax their branches atnight,scientists said.Researchers set up lasers that measured the movements of two silver birch trees at night.One tree was in Finland and the other in Austria,and both were monitored from dusk until morn After a long day, do trees fall asleep? It depends on what “sleep” means toyou, but trees do relax their branches atnight, scientists said.Researchers set up lasers that measured the movements of two silver birch trees at night. One tree was in Finland and the other in Austria, and both were monitored from dusk until morn