The strange state of being both completely exhausted and inexplicably wired at the same time — the overtired energy spike that hits after too many hours awake, too much caffeine, or the post-adrenaline crash that hasn't quite landed yet. Hyper knackered is when your body is screaming for sleep but your brain refuses to slow down, resulting in erratic energy, talking too fast, laughing at nothing, and making increasingly terrible decisions. It's the final boss form of tired before the full crash.
I'm so hyper knackered right now I just rearranged my entire bookshelf at midnight instead of going to sleep.
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