Question

why one is not advised to sleep under a tree?
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Answer 1

Answer:

So, because of respiration, oxygen is utilised and carbon dioxide is continuously produced. ... That is, the plants leave carbon dioxide at night. On the basis of this it is that in the night if you sleep under the tree, you will not get oxygen, which can cause breathing problem, suffocation etc...

Answer 2

Answer:

at night plants release CO2 and excess CO2 is not good for humans