Is the Temperature the Key Trigger of Sleep Organization?

In the past three years, that's what we've really understood, is that temperature is as powerful a trigger of sleep organization and sleep depth as light is. And if you look at these hunter gatherer tribes, a, you know, the sanin ar, the inimibia, their way of life hasn't changed for thousands of years. They don't go to bed necessarily as immediately as the sun down. But when they do really start to go to bed is when the temperature drops. That seems to be a thermal trigger for them getting sleepy and falling asleep. Then when you look when they wake up, they typically wake up 15 to 20 minutes before dawn. So i think

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