Sayyidah Aishah (may Allah be pleased with her) narrates that when the last ten (nights) began, the Messenger of Allah (peace and blessings be upon him) would keep his nights alive (in worship), wake his family, and tighten his waist-wrapper.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8560