This is because as you sleep you cool down. A cooler temperature is ideal to get to sleep but when you wake up the temperature needs to raise for you to feel the same.
This might be an evolutionary thing to cause us to sleep when it cools down at night and wake up with the heat of the morning sun.
If I want to automate my thermostat, should I cause my temperature to increase while asleep?
It’s actually true though, it is coldest just before sunrise. The outside temperature starts dropping when the sun is down and continues to do so through the night.
It’s actually coldest right after sunrise (some sources say a few minutes, some say up to an hour). But the general idea is when the first rays of light hit the surface at sunrise, there isn’t enough energy coming in to offset the amount of energy radiating away from the planet. So for a little bit after the sun rises, it’s still cooling down.
also spring cold vs fall cold
Haha, a nontrivial amount of “thermal comfort” comes from the radiant temperature of solid objects like walls and furniture, which are colder in the mornings after being in the chill all night. So that perception is not an illusion. It’s actually colder because you’re not receiving as much infrared radiant heat from your walls and stuff.
I had always wondered about that. Because the same temp in the house doesn’t feel the same in certain seasons.
