This led me to consider how to improve my physical condition and performance in an irregular work environment. Coincidentally, the habit of "power naps" was popular among Western business people, and I had personally experienced how a short break of just 15 to 30 minutes could significantly improve my concentration and creativity for the next few hours.
The relief from fatigue and the sense of mental clarity were like a fog lifting. This discovery was more than just a personal experience; it required further exploration.

How can I take a more efficient nap?
How to create a comfortable nap environment
With this question in mind, I began researching the mechanisms of napping, the optimal conditions, and the tools needed.

What we discovered was that by blocking vision even for a short period of time, we could enter a moderate state of sleep and achieve significant recovery.