I feel numbness in fingers. esp. after woke up fr nights sleep, or eating. why is this?

Could be: Related to some form of nerve compression, like carpal tunnel. Have your family doctor evaluate you, and decide if you need a referral to a hand surgeon.

Nerve compression: Numbness in the fingers, particularly at night, is a very common symptom of nerve compression such as carpal tunnel syndrome or cubital tunnel syndrome. Evaluation by a hand surgeon can help diagnose this and they will also perform either nerve studies and or ultrasound to assist with the diagnosis and confirm wether it is a nerve compression.