Native Sleep Timer Support

[joejelliss]

Problem

Currently, Music Assistant does not provide a native sleep timer functionality.
While this can be implemented through Home Assistant automations, it requires additional setup and is not very user-friendly for everyday usage.

A built-in sleep timer would significantly improve the user experience, especially for bedroom, children's room, or nighttime listening scenarios.

Proposed Solution

Add a native sleep timer feature to Music Assistant with options such as:

Stop playback after a selected duration
Optional fade-out before stopping
Per-player sleep timer support
Pause instead of stop (optional)
UI integration inside the player controls
Support for voice assistants / Assist

Example:

"Stop music in 30 minutes"
"Fade out music after 45 minutes"
Why This Would Be Useful

Many media platforms and audio systems already provide this feature because it is a very common use case.

Examples:

Spotify
Plex
Kodi
Traditional radio/alarm clock devices

Providing this directly in Music Assistant would:

improve usability
reduce automation complexity
make Music Assistant more accessible for non-technical users
improve mobile and voice assistant workflows
Additional Thoughts

A simple MVP implementation could initially:

store a countdown timer per player
stop playback once the timer expires

More advanced features like fade-out could come later.

Thanks for considering this feature.

[OzGav]

Sleep timer has been added in 2.10.0.b3