Can't disagree with the sentiment but the only idea I can think of is to have the duration of sleep variable based on the save success. This would mean it lands more often (when it would have failed outright) but only last a tick or two vs mid success 4-5 ticks vs critical fail being 7-8 ticks.

And then since we love edges so much, introduce one for necros to sense how affective it afflicted a victim.