成唯識論了義燈 5.237

5.237

《論》：令身安和故亦名定。西明云：雖非心所專注一境，令身安和故亦名定。《要集》云：有釋初釋為勝。今謂不爾。無心睡眠亦非心所，專注一境何無安和？亦名為定。故如由前加行定力，令身安和，以無心時安和，亦彼有心時安和，同得定名，故本解正。

The treatise says: "Because it causes the body to be calm and harmonized, it is also called an absorption." Ximing says: Although it is not a mental factor focused on a single object, because it causes the body to be calm and harmonized, it is also called an absorption. The Yaoji says: Among the explanations, the first explanation is superior. Now I say this is not so. Mindless sleep is also not a mental factor; when focused on a single object, why would there be no calmness and harmony, so that it too would be called an absorption? Therefore, it is as follows: through the power of the previous preparatory absorption, it causes the body to be calm and harmonized; because the calmness and harmony at the time of mindlessness is also the calmness and harmony at that time when mind was present, both equally receive the name of absorption. Hence the original explanation is correct.