What is the proof that one is allowed to pray more than eleven cycles (rak^ah) during the Ramadan Night-Prayer? 

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In Suratul-Hajj, Ayah 77 means, “And do good deeds so that you succeed.” The Prophet, salallallahu ^alayhi wa sallam, said, “The night prayer is a series of two cycles consecutively.” (Related by Al-Bukhariyy.) The Prophet also said, “The optional prayer is a great recommendation. He who wishes can pray a few cycles, and he who wishes can pray many cycles,” (Related by Muslim.)