Capsule hotels: sleeping units and shared facilities

The sleeping unit contains bedding and may have built-in lighting, ventilation or controls. Guests reach it from a shared corridor and use communal washing facilities. Storage arrangements, dimensions, equipment and provision for men and women vary between hotels.

From sauna rest space to sleeping units

Capsule Inn Osaka opened on 1 February 1979, with sleeping units designed by Kisho Kurokawa’s office. Designer Aiko Mogi recalls a project intended to provide overnight accommodation for sauna customers who had been sleeping in a rest area. The idea also drew on capsule-living concepts shown at Expo 1970. Design work began in 1977, with construction following in 1978–79.

Materials behind the moulded enclosure

The units also depended on an existing manufacturing skill. In a retrospective interview, a Kotobuki designer traced the company’s work with fibre-reinforced plastic (FRP) to 1956 and its use in furniture. Experience moulding complex shapes later helped realise the Osaka hotel’s 1979 sleeping units, which integrated a television, radio, lighting and clock within a compact enclosure.

The Osaka project used both end-entry units, with an opening in the short end, and side-entry units, entered along the long side. These are indoor sleeping compartments. Kurokawa’s Nakagin Capsule Tower, completed in 1972, instead used larger residential modules as parts of a building. The two projects explored compact space at different scales.

Hotels and workplace rest rooms

From the 1980s, sleeping capsules also found uses in workplace rest facilities. Hotel design later diversified: Kyoto’s 9h, opened in 2009, used capsule beds designed by Fumie Shibata. Facilities serving women and a wider range of travellers expanded the format beyond its early association with male sauna customers.

The nine-hour service concept

The Kyoto project organised the stay around showering, sleeping and preparing to leave. Its one-plus-seven-plus-one-hour formula was a service concept, not a compulsory nine-hour limit. The original Sleeping Pod used curved, individually made sections of fibre-reinforced plastic joined into a continuous form. Changing light was intended to guide sleep and waking, while other functions occupied shared space. Fumie Shibata led concept and product design, Masaaki Hiromura signage and graphics, and Takaaki Nakamura the interior: the redesign addressed the lodging sequence as well as the bed.