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| «sleeping box» |
Inside the metropolis, you can rent a sleeping box, and briefly catch up on some sleep on a narrow bed.
To sleep comfortably, you might think about replacing with a water bed, but the limited plane still has no help to stretch out.
If you really want to take a good rest, then, the sleeping box has to be complied with three-dimension utilization.
This box has a upper and a lower divisions, where the lower's holds water and may control its temperature as uterine warmth.
The upper's layer has a round hole, a waterproof film-bag capped on the hole; you go into the hole then sleep in the bag, for floating in water and breathing freely.
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