"When one of you stands up for offering voluntary prayer at night and finds it difficult to recite the Qur'an accurately, and he is unaware of what he is reciting, he should lie down." [Muslim]

«إذا قَام أحَدُكُم من الليل، فَاسْتَعْجَمَ القرآن على لِسَانه، فلم يَدْرِ ما يقول، فَلْيَضْطَجِع» رواه مسلم