What is the ruling on extending one's feet towards the Qibla in the mosque, and is it permissible to eat and sleep there?

There is no harm for a Muslim to extend his legs towards the Qibla, whether in the mosque or outside of it. There is also no harm in eating or sleeping in the mosque when there is a need, while maintaining its cleanliness. And in the event of a wet dream, one should exit immediately to perform ghusl (ritual bath) from major impurity.