I don't know if 10:00 is particularly late when sunset is around 9:00. I can't imagine that small children would want to go to bed when it's still light out.
In northern latitudes they pretty much have to. I do myself sometimes, in June and July, and wake up well past sunrise, which tomorrow is at 4:50. Nautical morning twilight (when the sky starts to visibly change colour) is at 2:53. (This is London, 55N. Most of Northern Europe is further north.)
(There's no "night" tonight, only astronomical twilight. But that's a technical definition -- it's dark outside.)