I ran on four hours of sleep and gas-station coffee for the whole push, and it worked, so I did it again the next month. I never notice what it is costing me until my body actually gives out, the migraine that flattens a weekend, the back that seizes. Then I rest just enough to get back to doing the exact same thing.
More people experience this than they realize.
You keep driving your body for the work and only see the cost when something breaks down.
If this sounds familiar, the Library can help you find the bigger picture.