Fun Fact #13 and #14: Assignments get the better of all of us, so yesterday they got the better of me. So I am going to tell you what happens when you get tired. So you're awake, your brain is busy thinking away and your neurons are busy firing. While this happens adenosine is produced as the day goes onwards it builds up in your body. When your receptors detect a certain level of adenosine in the body you start to get sleepy and as it increases so does how tired you feel.
Interestingly coffee simply blocks some of your receptors so you don't feel so sleepy, but the adenosine keeps right on building up. When you go to sleep your adenosine levels start moving downwards again. Some birds, dolphins, seals, lizards, and manatees can sleep with half of their brain and keep the other half awake so they can watch out for prey in a process known as Unihemispheric slow-wave sleep.
Is that surprise? :)
no its a fun fact
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