Museum events officer Emily Kerr-Bell said the Halloween-themed Pyjamarama was a fabulous way for children to see the museum in a different light.
"It’s awesome for us to be able to use our spaces in a way that they wouldn’t be able to be used during the day," she said.
It was "such a highlight for us getting to see all the young ones getting excited about it".
Pyjamas and costumes were encouraged and museum staff had enjoyed the opportunity to dress up as well, Ms Kerr-Bell said.
There were "lots of costumes going on — Wednesday Adams has definitely been the most popular so far".
Arts and crafts, face paintings and a magic show were all on offer as well as trails through the museum’s gallery.