It's a new concept for Belfast, but one that's been about in other museums for some time. London's Natural History Museum had it's latest monthly sleepover - Dino Snores - this weekend.
Have you ever wondered what happens when the visitors leave the Ulster Museum for the night? Does the Edmontosaurus rise and roar over Takabuti the mummy and does Peter the Polar Bear plod up to take a sneaky peek at the pottery and paintings?
Open to 7-11 year olds (P4-P7), with a minimum ratio of one adult per five children, nocturnal visitors should expect their night-time adventure to include a torch-lit tour of the museum and craft activities before settling down to sleep. The cost is £39.95 per place and booking is via 028 9044 0017 during normal museum opening hours.
The Ulster Museum is also running a competition for free places on its website.