When I get a lack of sleep (or especially multiple nights of bad sleep), I often have a splitting headache the next day that makes me unfunctional and worsens until I get more sleep. Other people I’m with have the exact same sleeping routines and never get any headaches, and can still function despite being tired. What’s wrong with me?
It’s your body. You can experiment. Check your electrolyte levels, check your blood pressure levels. When people don’t get enough sleep their blood pressure tends to go up, they tend to have more cortisol flowing in their bodies. So if your core metrics are on the high side, that might be enough to push you in a headache territory.