Capsule hotels are cheap, convenient, and more comfortable than some people might realize. Here's a selection of some of the world's most luxurious.

An curved arrow pointing right. Capsule hotels — hotels that feature futuristic pods instead of rooms — are a Japanese staple. Said to originally have been developed for traveling businessmen ...

A capsule hotel in Tokyo is collecting and analyzing heart rates, breathing frequencies and other data of guests to improve the quality of sleep. Information technology provider NTT Data Japan Corp.