I have heard that for an evil person, if they sleep, it is a good deed for them, because they cannot harm while sleeping. And sleep is the minor death. So if they are evil, then is suicide permissible?
wa `alaykum salam,
Muslims do not kill themselves. It is a sin. It is a crime. It is not an answer even to the evil person who is committing suicide nor to his family and society. Once he committed suicide he had lost a chance to ever make repentance (Tawbah). And Allah (swt) is ready to forgive even His most sinful servants. He is the Most Gracious, Most Merciful God of all of us. We should wish that everyone gets a chance to be forgiven before passing away.