Cots, champagne, fossils and fancy food all converged as New York City’s American Museum of Natural History hosted its first adults-only sleepover Friday night.

For a $375 fee — $325 for museum members — guests ate a three-course meal, checked out exhibits on poison and spiders, roamed artifact-filled rooms and slept under the Milstein Hall of Ocean Life’s famed 94-foot-long blue whale.

Many of the approximately 150 paying visitors took full advantage of their private run of the museum, with some roaming until after 4 a.m. i pu Attendees snapped selfies with T. rex bones, caught a late-night Hayden Planetarium space show and got close-up views of live creatures such as a tarantula, python, owl and lemur.

Some visitors even had the energy to embark on late-night singing and cartwheeling down empty halls.

The museum launched its first family-oriented slumber party in 2006 when actor Ben Stiller came for the premiere of his movie Night at the Museum. Since then, more than 62,000 people have spent the night there.

Friday night’s event has some similarities to past overnight adventures. For instance, guests viewed exhibits and slept on cots.

But the party also had some elements designed to better suit grown-up tastes. There were about 300 fewer attendees to make for a more private event.

While child attendees snack on fruit, granola and cookies, adults were served a dinner of chicken Francese, risotto and California wine.

For those with energy to keep going after a night with limited shut-eye, the museum offered a continental breakfast and a morning tour of the Hall of North American Mammals.