not all hours sleep/awake hours are equal - for example, I may be more work productive late at night, a better listener/learner in the mornings and better sleeper post meals, in the bath tub, travelling (my kids used to love falling asleep in the car).

Wonder if we could engineer multiple sleep intervals through out the single day (e.g. power napping, siesta's). There is plenty of dead time for me during the day that could be swapped out for sleep.. the question is at what cost to the body & mind?

Just a thought.