Catt sleeping behaviour?

Okay, so I have two babby catts. One is a mixed American Bombay (not completely black) catt (around eight moths old) and the other is a grey American Shorthair (around six moths old). The Bombay sleeps like 12ish hours a day, but is almost always partially awake (eyes usually half-open). If you just pass-by you'll grab his attention. The Shorthair sleeps like 18-20 hours a day and is always in a very deep sleep. Like, you could kill him and he wouldn't wake up. He also sleeps in a very vulnerable position (belly facing up). The Bombay is pretty fat and the Shorthair is skinny.

Is it just their breeds? Individual personality? Should I be worried about the health of one--or more--of them? halp
 
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