Characters
And I'll get to sleep at night. The deep slumber of a father whose daughters aren't out being impregnated.
— Mr. Stratford ‧ 10 Things I Hate About You

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker looks forward to sleeping soundly, with the peace of a father who need not worry that his daughters will become pregnant. The remark is dry and comic, presenting his anxious vigilance as the only thing keeping him awake.
Context reviewed