大乘百法明門論開宗義決 1.207

1.207

有無心位假立此名者。此通外難顯實有也。謂外難云。如諸聖教及五無心。所說睡眠雖無體性說睡眠言。今此睡眠何有別體。故此通言。而或有處於無心位立睡眠者。而由似此心所睡眠假立此名。此既心所故是實有。

"In the state of mindless[ness], this name is nominally established": this resolves an outside objection and shows that it is real. That is, the outside objection says: "In the various holy teachings and the five mindless [states], although sleep is spoken of, it has no real nature; why does sleep here have a distinct substance?" Therefore, this resolves it by saying: although in some places sleep is established in the state of mindlessness, this name is nominally established because it resembles this mental factor of sleep. Since this is a mental factor, it is real.