"Ye are all the children of light, and the children of the day: we are not of the night, nor of darkness" (I Thessalonians 5:5).
It may be significant that most of the days during the year which have been considered to have some special meaning are observed as "Days"--for example Independence Day, Veterans Day, Thanksgiving Day, etc. Those observed mainly at night--such as Halloween and New Year's Eve, tend to emphasize frivolity or even sinfulness. Christmas Eve may be an exception, but this celebration (December 25) rarely notes the real reason for Christ's incarnation.
It is for good reason that darkness has become a term referring not only to absence of daylight but also to absence of moral light. Many Biblical references make this connection. Note just a sampling.
"The night is far spent, the day is at hand: let us therefore cast off the works of darkness, and let us put on the armor of light" (Romans 13:12).
"For they that sleep sleep in the night; and they that be drunken are drunken in the night. But let us, who are of the day, be sober, putting on the breastplate of faith and love" (I Thessalonians 5:7-8).
"And have no fellowship with the unfruitful works of darkness, but rather reprove them. . . . But all things that are reproved are made manifest by the light: for whatsoever doth make manifest is light" (Ephesians 5:11,13).
All who have trusted in Christ have been "delivered" by our heavenly Father "from the power of darkness" (Colossians 1:13). It would be utterly irresponsible, therefore, for us ever to shame our Father by behaving like the children of darkness. "For ye were sometimes darkness, but now are ye light in the Lord: walk as children of light" (Ephesians 5:8). HMM