Cooling The Brain for Better Sleep

"Researchers report that cooling the brain may help some problem sleepers drift off faster and sleep longer.  In a study involving 12 insomniacs and 12 healthy sleepers, when the troubled sleepers wore specially designed caps that circulated water at cool temperatures, they fell asleep about as quickly as the normal sleepers did.  the chillier the water, the better those with insomnia slept.  The results support earlier findings that restless sleepers tend to show higher than nomral brain activity in the frontal cortex while they're trying to doze off.  The heightened activity reaises teh brain's temperature just as the body starts to cool off at the end of the day to promote sleep."

Cool Your Head to Fall Asleep
http://healthland.time.com/2011/06/17/tip-for-insomniacs-cool-your-head-to-fall-asleep/