Your taste buds are not broken. They are just tired. And there is a real reason your favorite meal can feel like chewing on nothing when you are running on empty.
When your body is exhausted, your whole sensory system slows down. Smell gets dull. Focus gets foggy. And your taste buds, those little flavor-detecting legends, basically clock out early without telling you. Scientists call it sensory fatigue. Your brain calls it "I give up, figure it out yourself."
Here is the wild part though. It is not just your tongue that stops working properly. Your nose does half the heavy lifting when it comes to tasting food. Fatigue hits your olfactory system hard, which means that beautiful pasta you made from scratch ends up tasting roughly like warm cardboard with herb dust on top. Brutal.