Humans adapt. We have abysmal bandwidth, so we have adapted. If anything is normal you don’t notice. You reserve bandwidth for the unexpected. You already know how to react and what to do/feel regarding daily life.

Break rhythm

Use it or lose it is true of the mind and the body. And it's better to burn out than to fade away (and no, I don't mean taking Kurt's way out).

I feel this way precisely because I keep doing new and novel things: there are so much to learn, think, and try out, I feel I am constantly in a rush.

When I was younger, I either have well-defined tasks or I would hit technical blocks forcing me to stop for a long time. Now, I get to work on all the hard problems to my heart's desire, and is also more skilled, thus hits way less blocks. I am in a constant race against my own ideas and desires to try new things...

It is cool and fulfilling, but also terribly exhausting most of the time :(