Got this idea from a fellow homeschooling mom: going without electricity on winter solstice. (Cheated a bit with central heating and the two times we opened the fridge.) The day seemed incredibly short, trying to get everything done and dinner prepared before it got dark. Which it wasn't authentically dark when you consider all the neighbors' Christmas lights.
The girls loved going by candle light. The Sisters at our parish liked the idea and donated former altar candles to our purpose.
Watching caveman TV, went to bed early.