The timing of temperature is relevant for those different types of sleep, of deep sleep and rem sleep. Deep sleep's going to want the first half of the night. As you get older, it's harder and harder to get deep sleep. And statistically, by the time you're 80, you may get almost no deep sleep. But again, temperature's talking to the old part of your brain. It by passes any thinking part. So when you're conscious, that's how we're able to trigger sleep states without you having to think about it. That's the power of temperature.

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