We all need sleep to survive, what happens to our body when we get sleepy is a mystery still surrounds much of our nightly shut-eye. It is not clear what it does to the body or why we need it.

Expert found out that it is the collection of certain proteins in the brain that triggers our desire to turn in.
This new understanding could offer a new target for drugs to treat insomnia and other sleep disorders.
‘Although sleep exists in all animals, why sleep is needed and how sleep is regulated remain a mystery. We set out to investigate the molecules that govern sleep need (or sleep pressure),’ author Dr Qinghua Liu.

And the signs that it’s time to get some shut-eye are consistent across species: yawning, heavy eyelids and heads nodding as the muscles relax and get ready to recline.


http://medfort.com.ng/what-happens-when-we-get-sleepy/