How do i know if its SPD?

My 8 years old has adhd and pdd nos. I read your checklist about spd.. i almost checked everything.i m so exhausted.. he still sleeps with us,tried melotonin,night lights, music,even our dog,he will not sleep on his own.he would jump off bed the second we moved out of bed. Awake around 4am everyday, running like a train..he is so impulsive, meltsdown on simplest thing, having hard time controlling his hands. Constantly talking nonstop,even when he is playing on the tablet. Couldnt focus during learning.. smelling everything..