Why do we need sleep? Researchers find the answer may lie in mitochondria Tiny mitochondria are easily over-stimulated, and will crash their own computers. This has profound implications for things like human hibernation and, at the rate they're going, we'll soon know how to turn the cells of our own bodies into Olympic Athletes. One of the bigger remaining questions is how do all of our cells communicate, and there is evidence they do so quantum mechanically, using photons. Note, this means that in physics sleep can be considered the default local minima. Sometimes, we dream not because dreaming is necessarily all that helpful, but because it helps us stay asleep.
This theory makes alot of sense. It could help explain certain cogntion problems and lead to cures or improved symptom management