The key to a good night's sleep may be a cooler bed. Because sleep researchers say, keeping cool throughout the night can help us sleep more soundly.

Normally, when you crawl into bed, the mattress is at room temperature. And once you lie down, the mattress starts to absorb your body heat which is why your bed can eventually feel too hot. And popular memory foam mattresses retain heat more than others - partially because you sink into them, so there's less airflow - and partially due to the nature of the material.

Some people are also "hot sleepers." They may have a fast metabolism, be overweight, or going through menopause. And men usually have a higher body temperature than women.

Plus, research shows that to fall asleep, our core body temperature needs to drop. So, if we start heating up, it can wake us up - even if we're not aware of it - which disturbs the quality of our sleep. Ideally the bedroom should be 72 degrees. That's according to the Florida Sleep Institute. But even if the room is cool - your bed may not be.

That's why mattress manufacturers are jumping on the cool-bed bandwagon.

They're marketing new beds with names like Arctic, Glacier and OptiCool to hot sleepers, and using cooling gel, circulating water, fans, and dual-zone temperature controls - which can chill one side of the bed to 46 degrees and heat the other to 118 degrees!

Cool mattresses cost anywhere from $12 hundred to $5 thousand dollars, and up. Don't want to spend big bucks on a keep-cool mattress? Consider trying cooling mattress pads and pillows, which cost about $50 bucks apiece.

But sleep experts say - just like no one would buy a TV these days without a remote control - soon, it'll be just as common to have a cooling mechanism in your mattress.