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Don’t worry—your Apple Watch isn't broken, and you aren't experiencing sudden anxiety. What you’re experiencing is a completely normal biological phenomenon known as the Post-Exercise Stress Window. Here is the neurobiology behind why workouts cause lingering sympathetic activation, and why those post-workout vibrations are actually a sign that your body is working hard to return to baseline.

You spent the entire day fighting off fatigue, dragging yourself from one meeting to the next. But the second your head hits the pillow, your brain switches into high gear. Your heart feels like it's racing, your mind starts spinning, and moving your body into restful sleep feels impossible. Welcome to being tired and wired.