Thanks. Interesting stuff.
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This is all rife with fascinating possibilities to explore and experiments to try.
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I've heard that most people's natural sleep cycle (and the one some people think we evolved with) is to sleep for about three hours, then to wake up in the middle of the night (for the night watch) for some hours, and then to sleep again for a time before breakfast.
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I wonder if the biofeedback people have done anything with this? It's possible to learn to increase alpha-wave time (and to alter all kinds of other things that usually are not considered under our control); I wonder if there are ways of learning new sleep skills.
It would be great to have some new skills and alternatives....