the past perfect

[constantinusphilo]

She trod out a more comfortable space for him in the heart of the grass patch, and though it had been dusty, airless and intolerably hot, and Ash,
having forgotten his fear, had become bored and restless, the heat and the enforced idleness had eventually made him drowsy, and shortly after midday he had fallen asleep. Sita too had dozed fitfully, soothed by the slow creak of bullock-drawn country carts plodding along the dusty road and the occasional jingle of a passing ekka.*
The Far Pavillions by Mary Kaye
I don;t know what justifies the use of the past perfect here.

 

[Barque]

It would help if you gave us the next two sentences as well.

Presumably, it's still the same day, maybe the evening. The past perfect links what had happened earlier that day to the present moment.

 

[emsr2d2]

"She trod out a more comfortable space for him in the heart of the grass patch, and though it had been dusty, airless and intolerably hot, and Ash, having forgotten his fear, had become bored and restless, the heat and the enforced idleness had eventually made him drowsy, and shortly after midday he had fallen asleep. Sita too had dozed fitfully, soothed by the slow creak of bullock-drawn country carts plodding along the dusty road and the occasional jingle of a passing ekka.*"
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Source: The Far Pavillions Pavilions by Mary Kaye
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I don't know what justifies the use of the past perfect here.

Please note my corrections and suggestions above. Take care when copying the spelling of titles. This is the second post in which you have misspelled "Pavilions".