Matthew 8:24

σεισμός, elsewhere of earthquakes, Luke and Mark have the more descriptive λαῖλαψ.

αὐτὸς ἐκάθευδεν. ‘He—the Master—continued to sleep.’ It is the only place where the sleep of Jesus is named.

The nominative of αὐτὸς is very rare in Matthew and Mark but very common in Luke. It has the proper classical force of contrast in this passage, but there is also some evidence that αὐτὸς was used of Christ in relation to his disciples as the Master in the sense of αὐτὸς ἔφα, cp. 2 Peter 3:4; 1 John 2:12; 2 John 1:6, where αὐτοῦ is used of Christ without any expressed antecedent.