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Thank you for your question.
The symptoms that you are having i.e. numbness is usually not a sign of blood clot.
By sleeping on your arm the most likely thing that can happen is a nerve pinch.
A nerve being pinched while lying on your arm can cause one to have numbness like what you are experiencing.
So it seems most likely to be a nerve problem rather than a clot problem.
A nerve can be pinched either in your arm or in your neck before it goes to your arm.
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I think that with the symptoms that you are mentioning it seems likely that it may be a problem with nerves being pressed in the neck by bulging discs or a bone disease of the neck leading to compression of the nerves in the neck causing your symptoms.
So I would recommend that you should have x-ray and MRI of your neck (MRI is the best test).
MRI will help tremendously in diagnosing your problem.
It does not sound like a clot.
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