Biological clock 

When your body starts to make red wine give you hangovers instead of just pleasure.

I think Mike’s biological clock is ticking because that guy is winewasted

Biological clock by Not Charles Xavier December 8, 2018

Biological Sleep Clock 

An internal clock where tells your body when to sleep and when to stay awake. It can be altered due to your habits, job, travels, etc.

My biological sleep clock is always changing becuase I travel so much!

Biological Sleep Clock by Karl Larkins February 17, 2015

busological clock 

Somebody who takes the same bus as you, that without meaning too, signals you that if you don't get your butt outside soon, you won't have a ride.

Kid:"Bye Mom."
Mom:"Why are you leaving now, you haven't even finished your breakfast?"
Kid:"Oh, Jake just walked by..he's my busological clock."
Mom:"Okay dear, have a great day at school!"

busological clock by Always Late July 27, 2008