四分律比丘含注戒本 2.33

2.33

If lodging together with a non-human female, an animal female, a paṇḍaka, or a person with two faculties, it is a duṣkṛta. During the day, if the woman stands while the bhikṣu lies down, it is a duṣkṛta. As for non-offense: not knowing there is a woman inside that room; if the room has no roof; if half-screened, slightly screened, or fully screened; if half-covered and screened, formulate the conditions according to the above; if lying down due to illness; being bound; perils to life, perils to the brahmacarya, and so forth—all are permitted.