Stock Sleep Tracker APK / Alternative

Hello everyone
Can someone please share the stock sleep tracker installation file, or recommend a good alternative? I’ve installed the FAW firmware and it’s great, but I really need to track how much I sleep.

I know about Sleep as Android, but is it as precise as the stock app? As far as I know, the stock one uses both accelerometer and pulse sensors, while SaA uses only accelerometer

I use SaA and run heart fit in the background. SaA takes it as a valid heart rate imput. Recent updates to SaA don’t drain the battery as much wither.