"The Prophet would awaken his family during the last ten (nights) of Ramadan."  

أَنَّ النَّبِيَّ ﷺ كَانَ يُوقِظُ أَهْلَهُ فِي الْعَشْرِ الأَوَاخِرِ مِنْ رَمَضَانَ  

"The Messenger of Allah would struggle (to perform Salat more) during the last ten (nights) more than he would struggle in the rest of it."  

كَانَ رَسُولُ اللَّهِ ﷺ يَجْتَهِدُ فِي الْعَشْرِ الأَوَاخِرِ مَا لاَ يَجْتَهِدُ فِي غَيْرِهَا