What Causes Tingling And Numbness In The Right Arm At Night?

Hi, For the last 6 or 8 months I ve been having issues with my right arm. Through out the day it is mostly fine. However at night , when I m asleep, It gets tingly and numb. It feels like blood / fluid goes into the arm, but doesn t flow out. So it feels like it builds up pressure, gets soar, and starts to ache. Basically from my neck and shoulder area all down to my finger tips. This wakes me up and usually can t get back to sleep. Another weird thing about it is, (I am a side sleeper usually), If it wakes me up, and then I roll on my back without a pillow, the tingling and pressure sensations somewhat go away. Then as soon as I roll back on my side it comes right back again. The only time it happens durring the day is if I m doing a constant holding motion with my hand. Such as holding a paint brush and painting a wall for a extended time. Or riding a motorcycle and having to grip the handle bars constantly for an extended period of time. I m not really sure who to turn to for something like this or even what type of Doctor to look for. My name is Mike Skubic and I live in Cottleville , Mo. Looking forward to hearing from you. Thanks.