Abu Salama ibn 'Abd ar-Rahman asked 'A’isha (may Allah the Exalted be well pleased with her):
“How was the ritual prayer of Allah’s Messenger (Allah bless him and give him peace) during Ramadan?” so she said: “Neither in Ramadan nor in any other month would Allah’s Messenger (Allah bless him and give him peace) add to the total of eleven cycles of [nighttime] ritual prayer. He would perform four — do not ask about their excellence or their length — then he would perform four — do not ask about their excellence or their length — and then he would perform three.”
‘A'isha said (may Allah the Exalted be well pleased with her): “I said: ‘O Messenger of Allah, do you sleep before you perform the odd-numbered ritual prayer [witr]?' He said: ‘O 'A'isha, my eyes may sleep, but my heart does not sleep!’”