Hanging stockings? Nah - socks go on feet. As a small kid you'll usually have a gift calendar but when you grow older it seems a bit over the top to get 24 tiny presents. Instead the Nisse will leave advent presents for you - a gift on each sunday.
The December sundays are special. They're the 'advents' meaning that you light one new advent candle each sunday. In my family we have a big Christmas lunch every year on the first sunday of advent.