One has expectations built up by accumulated kammic energy. However, such kammic energies can automatically bring arammana only if one has samyojana intact. As the number of samyojana goes down, the likelihood of kammic energies automatically bringing sensory inputs (arammana) will diminish.
Whenever I try to sit down in peace, my mind automatically gets bombarded with stressful thoughts about random things (yes, my life is a mess). When I analyze those thoughts, I can see that there is a pattern. Even though I don’t consciously generate them, they also don’t seem random as they involve memories of sensory experiences experienced with abhisankhara. But for an arahant with no samyojana left, are there no subconscious thoughts? In other words, do all thoughts need to be consciously generated by spending energy from food?