Unrelated, to anyone with toddlers in the 1.5 to 2 year range (or even older) who need a gentle hand sleep training or sleeping on their own, this clock is a god-send:
https://www.amazon.ca/LittleHippo-Ch...xpY2s9dHJ1ZQ==
Essentially it's just a visual clue for kids who don't know "time" yet, and you can set it to whatever times you want. They do need to be able to understand some things though, like relating the clock face to an actual face, and knowing eyes open/closed, etc.
Our kid took about 2 days to grasp that when the clock closes its eyes it's time for bed, and will also stay quietly in bed until the clock opens its eyes in the morning. We've had it for about a month now and she will shoo us out of the room when the clock closes its eyes, and will go to sleep on her own. The wife hates it because the baby doesn't want to be held anymore before bed lol she just wants to be put down in the crib.
It's expensive, yes, but it's an investment that has massively paid off.