AC 5962 - the time of day in heaven

AC 5962 [2, 4]
In heaven . . . spirits and angels have their morning, midday, and evening, also twilight, and again morning, and so on. It is their morning when the Lord is present and blesses them with manifest happiness: they are then in the perception of good. It is their midday when they are in the light of truths; and it is their evening when they are removed therefrom, and then it appears to them that the Lord is more remote and is hidden from them. All who are in heaven undergo and pass through these alternations, and cannot otherwise be continually perfected, for thereby they have relatives, and from the relatives a more perfect conception, since they thereby know what is not happy, because they thereby know what is not good and what is not true.

The concealment which is signified by "Joseph's sending his brethren away and their departing," is called in the Word "evening," and occurs with the angels at the times when they do not perceive the Lord to be present; for there is in heaven a continual perception of the Lord. When they are in a state of non-perception they are not then affected with good, neither do they see truth, as before; this troubles them, but shortly afterward the dawn comes, and so the morning.