system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it that when you pull an all nighter and you decide to finally go to sleep that all of a sudden you have this burst of energy, as if you're well rested?

ELI5 cause i just pulled an all nighter and i don't know how much longer i can stay coherent. Where is my body finding the energy to keep going? Is my body tricking me? Am i now safe to drive to work today? (Haha still not going in) I'm also talking about an all nighter without the help of coffee or red bull.
Edit: now after getting much needed sleep i wake up to great/simple to understand explanations to this! My 5 year old brain is satisfied-- That's how my brain feels after last night's deprivation.
gpt
Your body has a "biological clock".

If you wake up everyday at 7AM and one day you pull an all nighter and get home at 7AM you should get a lot of energy because your body thinks you need your everyday energy.