两步。
1，让homepod播放指定音乐列表或指定风格音乐
2，让homepod在指定时间后停止播放
待测试
让homepod在指定时间开始播放音乐，用作起床闹钟。1
You’re permitted to ask Siri to set up a sleep timer for anywhere from a couple of seconds to 23 hours and 59 minutes. What you cannot do is ask the assistant to set a sleep timer for a precise time, like 11pm. And lastly, you obviously cannot make multiple sleep timers.
是不能精确定时的，那就测测若干时间后停止播放。