A "capsule hotel" is Japan's solution for cheap accommodation for guests primarily wanting to sleep and nothing else. Though the idea sounds similar to a hostel, the sleeping quarters consists of "capsules" measuring approximately 2m x 1m x 1.25m/6.5ft x 3.3ft x 4ft (that's not much bigger than a coffin) and stacked next to and on top of one another. A separate section of the hotel houses the public bathing facilities, lockers for personal belongings and if you are lucky a restaurant or vending machine. It is also common to find men- or women-only capsule hotels, however they are predominantly used by men.
Read the full article: How to use a Japanese Capsule Hotel