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Start from simple sleeping on your back...
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or on your side.
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If you are longhair, use the benefit of your coat and tail.
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Remember that you and your box must nearly amalgamate.
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Use your imagination: try S-like positions..
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or C-like positions...
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or even L-like ones..
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If you totally trust your humans, relax your back legs to the maximun.
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Sometimes O-like positions do not fit the box well, but you can always make an experiment.
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If the box is rather small, try sticking your paws&tail; out of it...
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or stretch just one paw out, like this (back paw)..
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or like this (front paw)..
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Invite your friend to join you...
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and enjoy it.
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Your humans may wonder how you can sleep like that..
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ignore them and enjoy..
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Perhaps they will not even notice you..
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Try disguising to avoid unwanted attention..
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or you can hide in an absilutely unexpected box..
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This position is for experienced yoga cats..
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as well as this one..
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Even small boxes can do..
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Be creative..
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practice makes perfect. To get more experience, use as a box any structure you can find..
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Source: mysmelly