Hadith 479
479 - حَدَّثَنَا الْحُمَيْدِيُّ قَالَ: فَقَالَ سُفْيَانُ: هَذَا لِلنَّبِيِّ خَاصَّةً لِأَنَّ النَّبِيَّ تَنَامُ عَيْنُهُ وَلَا يَنَامُ قَلْبُهُ
Sufyan bin ‘Uyaynah says: This ruling is specific to the Prophet Muhammad (peace and blessings be upon him), because the eyes of the Prophet (peace and blessings be upon him) used to sleep, but his blessed heart did not sleep.