清明节植树的习俗，发端于清明戴柳插柳的风俗。
Tomb Sweeping Day tree planting custom, originated in the Dai Liu insert willow customs.
因为人们知道他们在做梦，并且相比于普通的梦，人们在清明梦中对自己的行为有更多的控制。
Since people know they are dreaming and are in more control of their actions in a lucid dream than in a regular dream.
当人们醒来并记得他们的梦时，如果他们再次合上眼睛就有可能进入一个清明梦当中，专注于梦境并且提醒自己正在做梦。
When people wake up and remember their dream, they may enter a lucid dream if they close their eyes again, focus on the dream and remind themselves that it is a dream.
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