Sometimes I sleep in a hammock and it helps a lot. I have a Grand Trunk and an ENO, both doubles, that fit me and my girlfriend comfortably. I prefer the Grand Trunk, but I use the ENO mounting hardware with it.
Normal adult cells use a small energy plant located inside them to produce most of their energy needs from oxygen, this is an aerobic process. In contrast, cancer cells rely mainly on the first part of the energy production process dependant on glucose (sugar), this is an anaerobic process.
Living things can find pretty amazing ways to survive, and anaerobic respiration is one example of this. Anaerobic respiration is the metabolic process in which oxygen is absent, and only the stage of glycolysis is completed. This occurs in microorganisms, but is also a temporary response to oxygen-less conditions in the cells of multicellular organisms, such as humans.