In that case:
Sleep tracking
Settings > Services > Smart light > Sleep phaser section > Sleep tracking
Settings > Sleep tracking > Wearables > Wearable > NONE
smart light for Phaser
Settings > Services > Smart light > Enabled (at the top)
Settings > Services > Smart light > Sleep phaser section > Smart light
HR
Settings > Sleep tracking > Wearables > Heart rate monitoring > DISABLED
Settings > Sleep tracking > Wearables > Smart Bluetooth > ENABLED
alternatively, you can let other service monitor HR, and let the data sync via Google Fit, S Health, or Health Connect