Tilda Swinton is sleeping in a fitted glass box at New York’s Museum of Modern Art (MoMA) this month.

Museum goers are able to peer in on Tilda Swinton while standing just feet from her padded glass chamber as she appears to lightly turn in slumber.

The Oscar-winning actress’ month-long performance art of public napping titled, The Maybe, is said to run the museum’s entire day – last seen totaling seven hours – but on days randomly chosen and said to be unknown even to the museum’s staff.

“Museum staff doesn’t know she’s coming until the day of, but she’s here today. She’ll be there the whole day,” a MoMA employee told Gothamist.

Tilda Swinton’s raised glass box will also move around the museum, rarely if ever appearing in the same location according to the source.

Tilda Swinton is sleeping in a fitted glass box at New York’s MoMA this month

On her first day Tilda Swinton was seen lying fully clothed while wearing jeans, sneakers and a buttoned up shirt.

Various photographs of her display showed her in just a few changing positions, leaving open questions on her full state of consciousness.

“I feel bad for her. It’s physically demanding. Is she just nocturnal for a month?” 17-year-old Than Fuirst of Manhattan told the New York Post.

A white card adorning a wall near Tilda Swinton’s aquarium labels her like any other piece of artwork in the building, showing the work’s title, artist, dates, and materials used.

In her case it reads: “Living artist, glass, steel, mattress, pillow, linen, water, and spectacles.”

This isn’t the first time the world has been offered a very public eye to Tilda Swinton’s sleeping, however.

Her art installation, The Maybe, first débuted in 1995 at London’s Serpentine Gallery.

Tilda Swinton later took her one-act to Rome’s Museuo Barraco the following year.