Sleep mode activation- feature request

Hello, I'd like to have a more accurate sleep mode (black and white watch face and no notifications). It basically turns on depending on the scheduled time, the problem is that not always the preset time si the real one of sleep. So sometimes it happens that I'm still awake, hanging around, walking or out with friends and I receive no notifications.

I'd like to have the sleep mode triggered on at the scheduled time ONLY if the watch doesn't detect awake activity, otherwise it is posponed after movements not compatible with sleep are not anymore detected.