Australian bedding sizes are not interchangeable with North American labels. A Cozey configuration named “Full” is not automatically identical to an Australian Double mattress. The safest starting point is the sleeping surface measured in centimetres.
Short answer: Measure three different things: the sofa's closed external dimensions, its fully extended external footprint, and the usable sleeping surface. Only the third tells you how much room a sleeper has; only the second tells you whether the furniture fits the room at night.
On This Page
- Bed names are useful shorthand, not measurements
- Cozey sleeper examples: actual sleeping surfaces
- How to choose fitted sheets without guessing
- Comparing Australian Double and Queen bedding
- External sofa width is not bed width
- A small measurement worksheet
- The bottom line
Bed names are useful shorthand, not measurements
On a regular bed, a mattress label generally follows a common size convention. On a modular sleeper, the name may refer to the nearest familiar size even if the surface is created from unusual modular sections. A taller person also needs to know which direction the longest dimension runs, and shoppers buying sheets need to know the perimeter the fitted sheet must stretch around.
In Australia, common mattress references include Australian standard Single (~92 × 188 cm), Double (~138 × 188 cm) and Queen (~153 × 203 cm) mattresses. Those are comparison dimensions, not measurements of the Cozey products.
Cozey sleeper examples: actual sleeping surfaces
Cozey sleeper examples: actual sleeping surfaces
| Example configuration | Approx. sleep surface (width × length) | Product naming / local interpretation |
|---|---|---|
| Neptune three-seat Full | 144 × 192 cm (56.7 × 75.6 in) | Named Full; wider/longer than typical Australian Double (138 × 188 cm) |
| Neptune Single + ottoman | 64 × 196 cm (25.2 × 77.2 in) | Narrower than a standard Australian Single (92 × 188 cm) |
| Orian two-seat Queen | 157 × 202.5 cm (61.8 × 79.7 in) | Similar to Australian Queen (153 × 203 cm), not identical |
| Atmosphere three-seat Sleeper | 150 × 225 cm (59.1 × 88.6 in) | Configuration-specific, non-standard |
About these measurements: Quoted product dimensions are approximate examples of named configurations, not universal dimensions for every arm, ottoman or module arrangement. Confirm the live configurator dimensions and bedding fit for the exact combination you select.
For Neptune, the three-seat Full is a useful reference layout. A compatible Single layout using a sleeper section and ottoman is much narrower but longer. Orian produces a Queen-labelled surface from just two sleeper seats. Atmosphere Sleeper is more flexible in arrangement, but its surface is generally non-standard; use its specified configuration dimensions rather than buying bedding by a Queen or Full label.
Diagram: The sleep surface is only part of the unfolded furniture. External arms, frames and required room circulation are additional considerations. Schematic, not to scale.
How to choose fitted sheets without guessing
A fitted sheet needs more than nominal length and width. The elastic must accommodate the actual perimeter and depth of the surface and, in some cases, the way modules meet. Before ordering bedding, check:
- Surface width and length, in the actual sleeping direction.
- Thickness and edge shape of the opened surface (some sofa beds do not form a conventional mattress block).
- Sheet pocket depth and elastic range instead of relying only on “Queen” or “Full” on a label.
- Any added ottomans or sleeper modules, which can change the overall length or shape.
- The manufacturer's matched kit, where a non-standard layout makes generic bedding unreliable.
Cozey's Neptune Sleep Kit includes a padded mattress topper, fitted and flat sheets, a comforter and pillows in supported kit sizes. The topper softens the feel of transitions between sleeper sections. Check the current local kit selection for your chosen layout; not every expanded custom bed has standard-sized matching sheets.
Comparing Australian Double and Queen bedding
An Australian Double mattress is typically about 138 × 188 cm, while Cozey’s Neptune Full sleeping surface is approximately 144 × 192 cm—not an exact Double. An Australian Queen is usually 153 × 203 cm; the Orian two-seat Queen sleeping surface is about 157 × 202.5 cm, very close in length but slightly wider. The Neptune Single-with-ottoman layout is around 64 × 196 cm, far narrower than an Australian Single of about 92 × 188 cm. “Full” is the Cozey product name, not an Australian bedding size.
External sofa width is not bed width
A closed Orian two-seater, for example, is about 185 cm (72.75 in) wide, while its named Queen sleeping surface is approximately 157 cm (61.75 in) wide. The difference is not a mistake: arms and frame are part of the sofa's external width. For room planning, use the widest exterior point; for sleeping comfort and fitted sheets, use the actual sleep surface.
Likewise, a Neptune Full sleeping width of around 144 cm does not mean the three-seat sofa is only 144 cm wide—it is about 228 cm wide externally. A single number cannot answer every sizing question.
A small measurement worksheet
A small measurement worksheet
| Measurement | What to record | Why it matters |
|---|---|---|
| Closed external width/depth | Entire sofa, including arms and backs | Everyday floor plan |
| Open external width/depth | Furthest extended furniture edges | Whether the door and walkway remain usable |
| Sleep surface width/length | Actual flat surface available to guests | How many people and how tall |
| Sleep surface height | Floor to top of sleeping surface | Ease of getting in and out |
| Bedding compatibility | Fitted sheet and topper measurements | Whether the bed can be made neatly |
The bottom line
The most reliable sofa-bed size guide is a dimension guide, not a name guide. Record the closed sofa, the fully opened furniture and the usable sleep surface separately. Then compare local bedding standards to the actual measurements—not the marketing label alone.
Editorial references and product specifications
- Cozey Neptune Collection
- Cozey Orian Collection
- Cozey Atmosphere Collection
- Cozey Neptune Sleep Kit (Canadian product reference; confirm local availability)
- Sleep Foundation mattress-size reference
- Australian mattress-size comparison — Ecosa