I am 4 weeks post op three level PLIF L4-S1. I have pain in my left leg after being up and around but the pain goes away after a night in bed. How much time should I be spending in bed during the day? I don't want to stay in the bed if I am supposed to be up and around. I walk about 1 to 1.5 miles per day but would feel the best if I laid in bed the rest of the time. What is your opinion?