Is it possible to increase the human brainpower? Not just become smarter, but actually more power and energy? Some say yes and NASA is working on ways to do just that, the applications are endless; from boosting the immune system to higher cognitive processing.
The human brain if it were run at a higher RPM at night by use of noise could increase the bio-systems abilities while sleeping? Music, has enough energy to power up a light bulb? If when you slept a machine insured you slept at 85 pulse rate like truck drivers are said to when idling their engines all night for lets say 4 hours. Then it would reduce the rate for deep sleep and REM? You could hook something up to the jawbone, which would take the sound waves from the brain waves and use that harmonic resonance or ELF alpha brain waves. This would be detrimental for some things such as deep sleep but would be beneficial for other things. If you built an android for space flight which was half human, half robot you use a polymer muscle and every few hours ping it and then allow it to move back and forth charging a small energy source by using magnetics and a pendulum technique.
The sounds of a space craft might be able to be converted to energy waves, which would heat up helium inside a nano box mini tank, the helium would expand during this process and heat up pushing a diaphragm against a friction power source? The helium would be conserved in the tank. Conservation of energy is ultra important for long-term space flight and tapping into the human bodies excess energy is just one way to go about it. There will be needs for power from important devices on the spacecraft. If your device was low power then it could be powered up a number of ways, such as any of these. Using an organism or a genetically modified person to produce more energy should be possible, the human brain and body do produce sufficient energy to move our bodies around so if we borrowed some, sure why not. Think on it.