I’m commenting on this as a single parent to 3, I had no choice, but to sometimes leave my youngest alone for a short period of time, while I was sorting her siblings out. It wasn’t what I wanted to do, but I didn’t really have much choice because they would wake her up and she would be very distressed. Now she doesn’t leave my side, but at the time if I needed to look after her siblings or have a quick wash I would leave her in her Moses basket with the monitor, watching her. I do agree with the light thing though just get a bloody night light