The Chillow is a decidedly low-tech soporific: an insert to keep your pillow cool all night. The manufacturer cites a study that claims that subjects using the Chillow fell asleep 68% faster and spent 21% more time in REM sleep. Of course, they only used 20 subjects and the differences were a matter of just a few minutes.
I do love a cool sleeping environment, though. When I travel, I crank up the A/C in hotels to counter the stimulating effects of the strange environment. I may just have to try this Chillow. Wired Gadget Lab gave it a 10 out of 10.
I could also sleep naked, lounging around on furs, like Brad Pitt in Troy. Usually I just catch a cold when I try that.