Some of the metrics used for training readiness and body battery (eg. HRV, stress, sleep quality) require sensor measurements during sleep. You'd be OK disabling Bluetooth, backlight and using a simplified watch face, but the other sensors should stay on to get the full benefit.
Like you said "disabling Bluetooth, backlight and using a simplified watch face, etc.." , if it could be done automatically during asleep(can keep sensor measurements work normally)?
