Vaisesika Sūtra 5.1.13

प्रयत्नाभावे प्रसुप्तयुतिस्य चलनम् ॥१३॥

prayatnābhāve prasuptayutisya calanam ॥13॥

[प्रयत्न-अभावे (prayatna-abhāve) - in absence of effort; प्रसुप्त-युतिस्य (prasupta-yutisya) - of one joined with sleep; चलनम् (calanam) - movement;]

Movement occurs even in the absence of effort in one who is asleep.