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It's probably your sitting position.

But as you work to figure out the reason, be aware that what's going on at certain levels of your spine can cause tingling and numbness in your extremities. I have suffered from sciatica for the past 7.5 years, due to a herniated disk at L5-S1. I've had two surgeries and it's still an issue.

I have also dealt with numbness and tingling in a my right arm for 20 years or so, along my ulnar nerve from the elbow down. I saw specialists and never really found a cause. But it has caused me to take sabbaticals from playing acoustic from time to time. I've suffered from shoulder/neck pain and severe headaches as well. My doctor finally put everything together recently and ordered an MRI. She found a crushed disk at C8. So after all of these years of wondering what was causing my issues, I know that another herniated disk is the cause. So don't count out that as a possibility.

Just wanted to mention that so you don't spend as much time wandering in the wilderness as I have, if the simple explanations don't answer your question.