Valmiki Ramayana Ayodhya Kanda Sarga 65 Shloka 16

पुत्रशोकपराजिते overpowered by grief on account of separation from the son, प्रसुप्ते fast asleep, कौशल्या च Kausalya, सुमित्रा च and Sumitra, कालसमन्विते यथा as if possessed by death, न प्रबुध्येते did not wake up.

Overpowered by grief on account of separation from their sons, Sumitra and Kausalya were fast asleep and did not wake up as if they were possessed by death.