Can you sleep in small spaces?

What is this glowing tube? It is a hotel room! Could you sleep here?

Some hotels in Japan made small rooms. They are big enough for one grownup to lie down. They are called “capsules.”
 

READ MORE: A capsule costs far less than a hotel room. How do builders fit a whole room in a tube? People leave their luggage in lockers. There are other rooms that guests use for showering or watching TV. Then people slide into their tubes to sleep. Some people don’t like small spaces. But some people feel safe and secure in small spaces.

“Children of the heav'nly Father, safely in His bosom gather; nestling bird nor star in heaven, such a refuge e'er was given.” — from “Children of the Heavenly Father,” Carolina Sandell, 1855