So I've started decreasing the temperature at night. The last couple of nights my sleep has been deeper with less disturbances. This may seem someone anti-peat because we all know the goal is to raise body temp not decrease it. But I think the one exception is night time. This is the one time its normal and actually healthy for the body to drop its temperature, presumably to preserve energy for other functions which are more important than physical/mental energy (you aren't using either when asleep anyway), such as cellular turnover/regeneration. I used to sleep in the cold all the time when I was healthier, but stopped only because I was told it was unhealthy, but now I'm gonna go back to it. You probably don't wanna be super cold like frigid, just cold enough to be comfortable.
I am beginning to think the goal is to raise your natural temperature set point and not your temperature per se. Because heat in excess of your body's preferred temperature will increase serotonin/prolactin/FFA/all kinds of nasty stuff, whereas increasing your baseline temperature setpoint will make you more fully functioning.