Filou and Tigris also can behave like that because their daddy gets up in the night and gives them food and entertainment. When I was alone with them for some days -I strictly ignored them one night (which was tough because they begin to scratch books and to destroy newspapers etc.). The second night it was already over-they were much more quiet.

Playing a lot during daytime so that they are really tired can also help.

Now as they are getting older it is all better but from time to time there still is a night..... (Especially with the full moon).