When Sleep Breaks the Ablution, and How Deep Sleep Is Measured
When does sleep break the ablution, and what distinguishes light sleep from deep sleep?
What breaks the ablution is sleeping while lying down or leaning such that he would fall were his support removed; sleeping seated with the seat settled on the ground does not break it, whether brief or long.
What breaks the ablution is heavy, engulfing sleep in which awareness is lost, even if brief or while seated; light sleep in which awareness remains does not break it.
What breaks the ablution is sleeping without the seat settled on the ground; sleeping seated with the seat settled does not break it, even if prolonged.
Sleep breaks the ablution except a little of it while seated or standing; as for one lying down and the like, such as one bowing or prostrating, his sleep breaks it whether little or much.