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.
Anaerobic reactions occur in the cytoplasm of the cell and aerobic reactions occur in the mitochondria of the cells. Notice in the picture below that glycolysis is happening in the cytoplasm and everything else is occurring inside the mitochondria, which require oxygen.