Choppiest sleep I've had in a long time, after weeks of less-than-ideal sleep. My smartwatch has given me a score of 53 with the notice “needs attention.”
Historically, I've always been a pretty sound sleeper, so I'm quite positive that this lack of sleep is coming from my biological alert system, the internal chemicals that tell you to stay on your feet and maintain caution. Our bodies are after all hardwired to be ready for danger. Experience passed down from one generation to the next over hundreds of thousands of years. That kind of experience does not lie.