3yr old has pain in one leg calf area almost every night. No swelling fever or limping. Hurting on and off for 1 1/2 yrs. No fever. Fine during day.

? needs to be examined by his/her doctor, what's comforting though is that your child is growing, acting fine, no swelling or other symptom, just observe for now, and check with the pediatrician for reassurance.