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This could be an early sign of peripheral neuropathy from your longstanding diabetes. When you sit, the circulation to the legs is reduced somewhat. Normally, this would not be felt. However, if the nerves going into the legs are partially damaged from the diabetes, they may be reacting earlier or to a greater degree than one would normally expect. Your doctor can check your circulation for signs of vasculopathy and check your nerves by doing nerve conduction tests (NCV/EMG). This will let him or her know if there are issues brewing that might need intervention.