Orion does not have fold-down bunks. Each crew member uses a personal sleeping bag they can secure anywhere in the cabin that feels comfortable. In microgravity there is no up or down, so bags may be mounted to seatbacks, along the cabin walls, or even oriented through the tunnel. Pilots and the commander will likely sleep in their seats while other crewmembers choose wall or tunnel locations.
The bags have a head opening and a forehead strap to keep the head stable. The main challenge is controlling floating limbs, so astronauts keep their arms tucked inside the bag or strapped down. Bags are tied to nearby attachment points to prevent drifting into one another — the so-called sleeping bumper cars — and to keep crew close to the toilet when needed. There are no built-in individual curtains, but a unisex privacy curtain is available at the lavatory.
Sleep on Orion is scheduled similarly to on Earth: roughly 1½ to 2 hours of pre-sleep wind-down, a full eight hours of sleep, then about 1½ to 2 hours for morning routines. The bags and tie-offs provide enough restraint and a blanket-like comfort so crew rarely need to rig extra bungees on themselves.
Orion’s interior is compact — roughly the space of two minivans for four adults — so every centimeter is planned. Food is rehydrated or warmed in a small heater panel, water is accessed through a floor panel, and exercise and storage are tightly arranged. The sleeping strategy emphasizes flexibility and personal preference, with astronauts choosing and sometimes rotating their sleep locations during the mission.