When we face exhaustion and tragedy we hit the end out our ability to know what to do or pray for. In those moments when all you can do is sigh, the Spirit steps in for us.
Romans 8:26-27
26 The Spirit helps us in our weakness; for we do not know how to pray as we ought, but that very Spirit intercedes with sighs too deep for words. 27 And God, who searches the heart, knows what is the mind of the Spirit, because the Spirit intercedes for the saints according to the will of God.