Answers

2015-01-18T16:19:56+05:30
During night trees does not release oxygen ,but they will release carbon dioxide which is harmful to us. Hence if we sleep under a tree during the night our health will be disturbed. 
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2015-01-18T16:21:33+05:30
The process of photosynthesis does  not occurs in nigh because no light . hence during this time CO2 is released and O2 is taken in . and if we sleep  under a tree during the night we will suffer from suffocation....
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co2 is released by the trees during night times which is harmful for us if we sleep under a tree.