例：It was nearly an hour before the sleeping pill took effect.
Many sleeping pills stop working after a few hours, and most should not be combined with other medications.
※ 与sleeping pill息息相关的一个词就是insomnia（失眠、失眠症）
例：Sleeping pills help when stress, travel or other disruptions keep you awake. If you have chronic insomnia, a better approach may be to remove the cause by changing your lifestyle.
Police have said Park had been under stress because he had to juggle management of his entertainment company and career while his father was fighting stomach cancer. The actor had been taking sleeping pills due to insomnia, police said, citing Park's mother.
Park debuted in the late 1990s and starred in the 2002 television drama series "Winter Sonata," which was also watched by fans in Japan and Southeast Asia. He held several concerts in Japan and released eight CDs there.
——Excerpt from Mourners bid farewell to popular S.Korean actor