sheep cloak 

a lambskin condom for those unlucky guys who are allergic to latex

Dude, this girl wants my cock! Can I borrow a sheep cloak?

No, you loser. How about you go skin a lamb?

sheep cloak by JMayzin September 15, 2009

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