'Sleep' in the Bible

For David, after he had served his own generation by the will of God, fell on sleep, and was laid unto his fathers, and saw corruption:

And the keeper of the prison awaking out of his sleep, and seeing the prison doors open, he drew out his sword, and would have killed himself, supposing that the prisoners had been fled.

And there sat in a window a certain young man named Eutychus, being fallen into a deep sleep: and as Paul was long preaching, he sunk down with sleep, and fell down from the third loft, and was taken up dead.