Hadith comprehension

What does the pronoun “ـهُ” refer to in “نَوْمَهُ، طَعَامَهُ، شَرَابَهُ”?

Travel, repayment, service, and sufficiency (Hadith 37–43)

• The person affected by the journey
• A different person in each word
• Only the route of travel
• The duration of the journey