Introduction: During the process of photosynthesis plants use the energy from the light, water from the ground, and carbon dioxide from the air to produce sugar, starch and cellulose. The byproduct of this process is oxygen. All the oxygen in the atmosphere is actually made by plants on the ground and in the oceans. At night however, plants absorb oxygen and release carbon dioxide.

In many places it is a common belief that you should not sleep under large trees at night, because the shortage of oxygen and excess production of carbon dioxide may suffocate you. We don't know how accurate such claims are, so we want to investigate part of such claims.