It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that once the Prophet (peace and blessings be upon him) was in the house of one of his noble wives. After a short while, the Prophet (peace and blessings be upon him) rested his head and fell asleep. During his sleep, he began to laugh. When he woke up, one of his noble wives asked, "You were laughing in your sleep, was everything alright?" He replied, "I was feeling happiness for those people of my Ummah who set out on a sea journey to frighten the enemy; they are striving in the path of Allah." The Prophet (peace and blessings be upon him) mentioned great goodness for them.