体内時計

I've heard that human's body time cycle is 25 or 26 hours, it's not 24 hours. That's why it's easy to stay up late. 

 

Yuki : I am not sleepy today.

Nyankichi sensei : let's sleep soon...

Frog : zzzzz

 

Thinking about how the human body influenced by earth's time cycle, for example summer time, Feburary 29th, the movement of moon etc etc is amazing. 

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