yap, it is important if you use teslafi as you need to set the sleep timer properly so it does not keep the car awake. Mine is actually set to 15min so the car would go to sleep in less than that. It might be wifi, i have read reports that a weak wifi connection can keep the car awake. Might be worth deleting your wifi network. I can only recommend looking into this sleep thing as you will burn a lot of electricity of a year if the car does not sleep properly. Idle Model 3 Uses 200-250W, sleepy Model 3 uses <25W.