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 could always see a doctor about it, such pain is a valid reason. And of course, even without headache, it’s good for your health to maintain a good sleep schedule