if any key is pressed you can hold your eyes open a little longer. If you are on mobile you can click the backdrop to keep you eyes open.
look at the bottom right to see what your eye balls look like. If your eyes are normal you are fine. If your eyes have red lines you eye is your getting tired. If your eyes are simi red your getting closer to blinking. If your eyes are entirely red you're about to blink. If your eyes are closed you blinked
