Why is it that many people say that it is not good to sleep under a tree at night, why ?

During the day, in presence of sunlight, the plants use up the Carbon dioxide and release Oxygen in the process of photosynthesis. But during night, plants won’t perform photosynthesis so they are unable to use the Carbon dioxide and this further leads to increase in the proportion of carbon dioxide in the air. During night the trees breathe in oxygen and release Carbon dioxide. If one sleeps under the trees, the amount of increased Carbon dioxide in the air around will certainly affect the health. So it is inadvisable to sleep under trees during night. He suffers from suffocation. He feels excess weight on his chest. For this reason, some rural people imagine and fear that ghosts would come and sit on their chests if they sleep under Peepal or Banyan trees.