镇静安眠剂

例句：

1. 1. The doctor prescribed a sedative to help her sleep.
   医生开了一种镇静剂来帮助她入睡。
2. 2.She took the sedative before going to bed.
   她在上床睡觉前服用了镇静剂。
3. 3.Sedatives are often used to treat anxiety and insomnia.
   镇静剂通常用于治疗焦虑和失眠。