Maybe, but it's certainly a nice surprise when it happens
There's a little bit on Christmas Nights here for people who haven't heard of it
The game uses the Saturn's internal clock to change elements of the game according to the date. In November and January, the title screen label "NiGHTS: Limited Edition" is changed to "Winter NiGHTS", with the lush greenery of the environment being replaced by white snow. During December, "Christmas NiGHTS" mode is activated, resulting in further Christmas-themed alterations, such as item boxes becoming Christmas presents, Nightopians dressing in elf costumes, and Christmas trees replacing Ideya captures. The background music is replaced by an instrumental version of "Jingle Bells", as well as there being a "Christmas-like" rendition of the boss theme. Other cosmetic changes are visible on New Years day, and loading the game on April Fools Day results in Reala replacing NiGHTS as the playable character.
http://en.wikipedia.org/wiki/NiGHTS_...ristmas_NiGHTS