What an excellent man ‘Abdullāh is if only he observes the night prayer
Authentic hadithوعن سالم بن عبد الله بن عمر بن الخطاب رضي الله عنهم عن أبيه: أن رسول الله صلى الله عليه وسلم قال: « نِعْمَ الرَّجُلُ عبد الله، لو كان يُصلِّي من الليل» قال سالم: فكان عبد الله بعد ذلك لا يَنامُ من الليل إلا قليلًا.
Sālim ibn ‘Abdullāh ibn ‘Umar ibn al-Khattāb (may Allah be pleased with him) reported from his father that the Messenger of Allah (may Allah's peace and blessings be upon him) said: "What an excellent man ‘Abdullāh is if only he observes the night prayer." Sālim said: "Since then, ‘Abdullāh would not sleep at night but very little."
Explanation
The Prophet (may Allah's peace and blessings be upon him) said that ‘Abdullāh ibn ‘Umar was a righteous man and encouraged him to perform Qiyām. So, since then, he used to sleep very little at night.
Source · Narrated by Bukhari & Muslim
From the Hadith Encyclopedia (hadeethenc.com).