Charles H. Spurgeon on Psalms 90:4

As yesterday when it is past, and as a watch in the night. He corrects the previous clause with an extraordinary abbreviation. For he says that the whole space of human life, although it may be very long, and reach a thousand years, yet with God it is esteemed not only as one day, which has already gone, but is scarcely equal to the fourth part of a night. For the nights were divided into four watches, which lasted three hours each. And indeed by the word night, it is meant that human affairs in this life are involved in much darkness, many errors, dangers, terrors, and sorrows. —Mollerus.