For years I ran on coffee and four hours of sleep, sure my body would just keep up with whatever I threw at it. Then one afternoon I couldn't read my own screen and my hands were shaking at my desk. Now I catch myself reaching for that same old pace, and I have to remember my body isn't a machine I can run into the ground.
More people experience this than they realize.
You are learning to treat your body as something you can use up, not something that lasts forever.
If this sounds familiar, the Library can help you find the bigger picture.