ELI5: Why do we get "second winds" when we are exhausted?
I’ve noticed that sometimes when I’m pulled an all-nighter or I'm way past my bedtime, I suddenly go from feeling like a zombie to being wide awake and full of energy. It feels like my brain just decided to drink three espressos out of nowhere, even though I haven't had any caffeine.
How does our body suddenly find this hidden energy when we should be crashing? Is it actually "fake" energy, and do we pay a price for it the next morning?
u/avz008 — 17 hours ago