What on earth do they do in countries close to the arctic circle??
Dark 24 hours a day for part of the year!
Are children invalids? For the most part no!
Give them a torch and a red light/reflector on their coats or wear on of those reflective tabbards, builders wear.
Make the Scottish kids eat carrots, it doesn't help to see in the dark but good for them to eat at least some veg and not just battered haggis.
Kids wake up at the worst times!