'Sleeping' in the Bible

So David and Abishai came to the people by night: and, behold, Saul lay sleeping within the place of the wagons, with his spear stuck in the ground at his head; and Abner and the people lay round about him.

And he cometh unto the disciples, and findeth them sleeping, and saith unto Peter, What, could ye not watch with me one hour?

And he came again and found them sleeping, for their eyes were heavy.

lest coming suddenly he find you sleeping.

And he cometh, and findeth them sleeping, and saith unto Peter, Simon, sleepest thou? couldest thou not watch one hour?

And again he came, and found them sleeping, for their eyes were very heavy; and they knew not what to answer him.

And when he rose up from his prayer, he came unto the disciples, and found them sleeping for sorrow,

And when Herod was about to bring him forth, the same night Peter was sleeping between two soldiers, bound with two chains: and guards before the door kept the prison.