Since no one's answered you yet, I'll have a shot
Could it be that you've changed your footwear...either running shoes or normal shoes? Just wondering if your footwear is pressing on a nerve and causing the numbness.
Also, when you say numbness, do you mean like pins and needles or are they pale with lack of blood supply?
If you haven't had a proper gait analysis and shoe fit, you really should. I'm not saying it'll stop the pins and needles but you really shouldn't be running in shoes that may not be right for you.
Another thought. I wonder if your blood pressure is dropping quite low while you're asleep and this is causing your pins and needles. It's possible if your resting heartrate has lowered due to increased fitness
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