Luke indeed avoids the question which might be put to him with regard to the order of time, saying, that He went into a ship on a certain day. Now if the storm had arisen when our Lord was awake, the disciples either had not feared, or not believed that He could do such a thing. For this cause He sleeps, giving them an occasion for fear; for it follows, But as they sailed he fell asleep; and there came down a storm of wind on the lake.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Hom. 27. in Matt.