No, he ought not to drowse....

And half an hour later he was slumbering profoundly without knowing at what moment he had slid down the soft slopes of sleep.
Suddenly he awoke as if some one had hit his head with a club.

His ears were buzzing....

It was the rude impression of one who sleeps without wishing to and feels himself shaken by reviving restlessness.

Some moments passed without his taking in the situation.