Numbness In Fingers And Arm. Serious?

Hi. I woke up last week and the outside skin between my right thumb and forefinger had become slightly numb. I noticed also that the upper part of my right arm also had a similar sensation. However I often wake up with pins and needles in my hand / arms as if I have pinched a blood vessel or vein in my sleep. The numbness is slowly diminishing after a week. Is this something I should take seriously? I am 53 years old and otherwise healthy. My BMI is below average, by blood pressure is 130 / 80, my heart rate is ~80 / minute and my blood sugar is 4 on a scale of 2 ~ 6. I also walk 1 to 2 hours a day, 7 days a week and generally feel fine. I don t think I have any high risk factors but I wonder about other potential degenerative diseases such as Alzheimers as I find that my short term memory sometimes turns off lately. Again, any suggestions are welcome.