I did not plan what I said then. I was in too much pain, half delirious. But I asked through chattering teeth, “Are you my friend now?”
“Yes,” he replied. “As you are mine.”
I could not help smiling all the way into dreams.
In The Hundred Thousand Kingdoms, at one point Yeine orders the human Naha to 'have pleasant dreams'. Though it's not stated that clearly within the series, it turns out that because Yeine never rescinded the order, Human!Naha always had pleasant dreams from then on, which made his nightmares go away permanently.