You can't. Some games allow you to though, it depends on the game really.
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Currently, You can't lie down in a ROBLOX game unless the creator added some way for you to do it (By either a tool, GUI, or some other means). There is no universal button or key that you can press that will let you do it in any game you want.
No, Roblox is not shutting down, and there are no other information to prove that it is. Thanks.
It is either your Internet is down or you haven't downloaded roblox yet.
Yes, yes it is...
Not currently, most of them have been shut down by Roblox officials