Was the deceased's father aware of his death while he was asleep? Did he feel the throes of death? What is the ruling on the death of someone who is asleep or ill? And how did he know of his death 40 days beforehand?

Death is a great sign among the signs of Allah, encompassing the minor death in sleep. It is inevitable for every soul and a mercy for the believer, removing the barrier between him and the reward for his deeds. The ruling for one who dies in his sleep is the same as for other deceased Muslims concerning washing, shrouding, and praying over him. There is no specific legal ruling based on his knowledge of the throes of death. It is advisable to seek forgiveness, supplicate, and give charity on behalf of the deceased, for no one knows when or where they will die.