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?
You might be overly sensitive to caffeine. I can’t have caffeine after, say, 1pm, or it will make my sleep restless. Maybe try no caffeine after breakfast.
Another possibility is maybe you’d do better working nights. Then you sleep during the day.