Sahih Al Bukhari – Book of Dress
Volumn 007, Book 072, Hadith Number 852.
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Narated By 'Abbad bin Tamim's uncle RA : I saw the Prophet PBUH lying-down in the mosque and placing one leg on the other.
Purpose of sharing this Hadith:
1- A lot of muslims who really want to know every single sunnah of Prophet PBUH will know that lying in mosque is one of the sunnah.
2- if someone thinks that lying in mosque is not allowed, then this hadith is sufficient as a reason/justification that thier understanding is not correct.