Usually you'll say 'Good night' when you go to bed at night,what should be said when you go to sleep at noon?

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Sweet dreams!
or
Sleep well!

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You could still say 'Good night', even though it isn't night, if they are going to bed and ending their day.  Technically it isn't correct, but they will know what you mean.  Or you could say, 'Have a good sleep.'

If they are just going to sleep for an hour or two (taking a nap), you could say, 'Have a good nap.'

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You say: If you disturb me you're dead.

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perhaps------leave me alone!

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good noon?.....sleep with angels?.....sweet dreams?.........? wake up to be ready at the time going clubbing?........etc