| a state of semiconsciousness, usually produced by hypodermic injections of scopolamine and morphine, used chiefly to effect relatively painless childbirth. |

| twilight sleep n. An amnesic condition characterized by insensibility to pain without loss of consciousness, induced by an injection of morphine and scopolamine, especially to relieve the pain of childbirth. |
twilight sleep twi·light sleep (twī'līt')
n.
An amnesic condition characterized by insensibility to pain without loss of consciousness, induced by an injection of morphine and scopolamine, formerly used to relieve the pain of childbirth.