More on Keep Good Hours from Infoplease:

• Keep Good Hours - Keep Good Hours (To). To retire to bed somewhat early. To keep bad hours is to sit up late at ...
• Hour - Hour (Greek and Latin, hora.) At the eleventh hour. Just in time not to be too late; only just in ...
• Dictionary of Phrase and Fable: K - Definitions, origins, and illustrative excerpts for words, phases, and literary allusions starting with "K"