A measure of time – the blink of an eye, the wink – traced back to King Nimi.
He was cursed to have to live without a body. After a long time the Gods offered him a body so that his people could have a king again.
Nimi refused, a body was a prison for the soul. He said he wanted to be invisible to everyone. So King Nimi dwells in the eyelid.
Read about King Nimi here