It's an Ikea Himmene Sleeper Sofa. These have long been discontinued, and I'm not sure why.
From Google Gemini's AI overview of the Himmene: "The IKEA HIMMENE sleeper sofa dimensions are roughly 200 cm wide (about 79 inches), with a depth of around 91 cm (36 inches), a height of 91-92 cm (36 inches), and it converts into a bed that is about 140x200 cm (55x79 inches), featuring solid wood, particleboard, foam, and polyester fabric, with some models including storage boxes and trays. "
It's a nice comfortable sofa, and it transforms into a nice comfortable bed. And the transformation is easy: the sofa seat pulls out and the back of the sofa flips down. It takes about 30 seconds and requires no strength. Underneath the seat there's also a good amount of storage for pillows and blankets and such.
The catch here is that we've owned this thing for a while. The cushions are still in great shape, and the mechanism of the bed works like new. But the upholstery has taken a beating from sharing a house with two kids. There are two stains (both food stains) on the couch seat, which we've covered up with a fabric cover (included). With some love and attention, they could probably worked out.