Is it permissible to sleep or rest in a mosque, including while others are performing the obligatory prayer?

Summary

The fatwa states that the ruling on sleeping in a mosque depends on local circumstances and the condition of the mosque, and it is neither absolutely prohibited nor absolutely permitted. Some people slept in mosques historically, such as the Ashab Suffah, but today it may cause contamination, disturb worshippers and harm the mosque's image, so it is unsuitable in those cases. It recommends choosing a suitable place under the mosque committee, with dedicated rest areas for travellers. Sleeping while others pray on the grounds of having already prayed is also inappropriate as it creates negative perceptions, and mosque guards should use discretion without restricting those performing iktikaf.

Written in our own words from the original fatwa — check the source before acting on it.