Im in my 3rd trimester & i have notice that when im sleeping on either side my arms go numb, & i have been having some leg cramps. is it normal?

Staypuff marshmellow: At this stage in pregnancy you are carrying a heavy child, and an enormous amount of circulatory fluid and extra blood so when you sleep on your arm, it too "goes to sleep" from the pressure and temporary obstruction of circulation and nerve compression. Use pillows liberally and change positions often to avoid the problem.