So his eyes grew tired, and more and more tired, and his eyelids grew so heavy that they would keep tumbling down over his eyes.
He kept lifting them and lifting them, but every time they were heavier than the last.

It was no use: they were too much for him.

Sometimes before he had got them half up, down they were again; and at length he gave it up quite, and the moment he gave it up, he was fast asleep..