"It smelt of laudanum"
Laudanum (Tincture of Opium)
Public DomainLaudanum (Tincture of Opium) - Credit: Djm55/Wikimedia Commons

 Laudanum is a herbal preparation containing opium and alcohol, used in the 19th century to treat a number of different ailments, but mainly as an analgesic. It was sold without a prescription at the time, but today is strictly regulated. It is a narcotic drug that can induce a deep sleep.