1. 
   Waterbed
   A waterbed, water mattress, or flotation mattress is a bed or mattress filled with water. Waterbeds intended for medical therapies appear in various reports through the 19th century. The modern version, invented in San Francisco and patented in 1971, became an extremely popular consumer item in the...
   Found op http://en.wikipedia.org/wiki/Waterbed
   
   
2. 
   waterbed
   1) It may rock you to sleep 2) Liquid-filled sack? 3) Spot for a swell sleep?
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/waterbed/1
   
   

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