Eric Wong (R), managing director of a capsule bed manufacturer, and his son Osbert pose in modified capsule beds inside a showroom in Hong Kong January 7, 2012. The beds, which are modified for the Hong Kong market, have adjustable ceilings, a larger air conditioner and a TV. They are aimed at university students and budget mainland Chinese travellers visiting the territory and will cost $450 a month or $30 a night, according to the manufacturer. REUTERS/Bobby Yip Capsule hotels that offer tiny accommodations for frugal travelers are popping up across Europe and other parts of Asia.

The micro-hotels have been popular in Japan for decades, and now they can be found in Russia, China and some European airports.

In expensive cities like Moscow — where hotel rates for business travelers have been the highest in the world for about nine years straight — the capsule hotels can charge as much as $250 for 24 hours, Bloomberg reports.

Others are less expensive and charge about $85 per night. Some cost as little as $7 per night in certain parts of Asia.

The rooms may be just big enough to fit one person, but many of them come equipped with amenities you'd find at any other hotel — TVs, WiFi access, and improvised desks and dressers.