1 Thessalonians 5:7

For they that sleep sleep in the night; and they that are drunken are drunken in the night.

There is no need to hunt metaphors here. These words are "not to be taken metaphorically, but as a simple statement of fact - what occurs in ordinary experience."[15] Immorality, drunkenness and debaucheries of every kind are practiced principally at night. Long before the Christian era, the association of drunkenness with night was so universally accepted that when Peter defended the apostles against a charge of being filled with new wine on Pentecost, he appealed to a universally accepted truth, "These are not drunken, as ye suppose, seeing it is but the third hour of the day" (Acts 2:15). There has always been something about wickedness which makes it inappropriate to indulge in it in the daytime. Night is the time for the deeds of darkness. George Elliott has a beautiful passage on this, quoted by Moffatt:

There are few of us who are not rather ashamed of our sins and follies as we look on the blessed morning sunlight, which comes to us like a bright-winged angel beckoning to us to quit the old path of vanity that stretches its dreary length behind us.[16]

[15] P. J. Gloag, op. cit., p. 103.

[16] James Moffatt, op. cit., p. 40.