The scores are relative to each other.

I certainly prefer to sleep than to procrastinate, so this matches up with your example.

And, I certainly prefer to do almost any task than procrastinate. Procrastination (by which I understand: wasted effort thinking about being productive without actually doing anything) makes me feel grim. I would have valued that time more doing almost anything else.

If sleeping helps me to avoid procrastination, then this scoring system still encourages sufficient sleep to do that.