It is not good to sleep under a tree at night .. because at night Tree gives out Carbon Dioxide... If u sleep under a tree u vil feel uncomfortable and suffocated too...
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It is not good to sleep under the tree on nights this is because of the trees release carbon dioxide on nights. So, the percentage of carbon found there in nights under the trees is high when we compare in mornings. If one sleeps under the trees, the amount of increased CO2 in the air around will certainly affect the health. 
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plzz click on thanks and mark it as best... hope it helps u