Hadithcore
Sahih Muslim, 2261 c
sahih

This hadith has been reported on the authority of Zuhri with the same chain of transmitters, but it does not contain the words:

"I felt disturbed because of that," and there is an addition of these words in the hadith transmitted on the authority of Yunus: "Then spit thrice on the left side when you get up from sleep."

وَحَدَّثَنِي حَرْمَلَةُ بْنُ يَحْيَى، أَخْبَرَنَا ابْنُ وَهْبٍ، أَخْبَرَنِي يُونُسُ، ح وَحَدَّثَنَا إِسْحَاقُ، بْنُ إِبْرَاهِيمَ وَعَبْدُ بْنُ حُمَيْدٍ قَالاَ أَخْبَرَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا مَعْمَرٌ، كِلاَهُمَا عَنِ الزُّهْرِيِّ، بِهَذَا الإِسْنَادِ ‏.‏ وَلَيْسَ فِي حَدِيثِهِمَا أُعْرَى مِنْهَا ‏.‏ وَزَادَ فِي حَدِيثِ يُونُسَ ‏

‏ فَلْيَبْصُقْ عَلَى يَسَارِهِ حِينَ يَهُبُّ مِنْ نَوْمِهِ ثَلاَثَ مَرَّاتٍ ‏

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References2 variants
In-Book Reference
Book 42, Hadith 3
USC-MSA web (English) reference
Book 29, Hadith 5615 (deprecated numbering scheme)