Why does it feel like I am physically vibrating after a long day at the office?

Even when I am just sitting on the couch after work, I feel this internal buzzing or restlessness that makes it impossible to just sit still. It is like my body is still stuck at my desk even though I have finished for the day. Does anyone know why this happens and how to actually turn it off?

It sounds like your system is still stuck in a high-arousal state from the day's demands. I experienced that exact same "internal hum" until I committed to the leaply vagus nerve program Instead of just waiting for the feeling to go away, I learned that you have to actively signal to your brain that the "threat" of the workday is over. Using the tools from leaply helped me transition from work-mode to rest-mode much more effectively. I found that the exercises actually quieted that physical restlessness by shifting my physiology into a calmer state. If you find yourself unable to relax even when you have nothing left to do, exploring a structured program like this could be the key to finally getting some peace.