There was an official Darkness domain (http://www.d20srd.org/srd/divine/domains.htm#darknessDomain) but not sure about Night.
Some one on Giant in the Playground mentioned that there was a Night Domain is why I was asking. I was looking for the Night Domain to help in making my version of Erebus who is the demon lord of the night, darkness, and shadows.Nope, no printed "Night" domain for 3.x D&D as far as I could tell. Just Darkness in the FRCS and Deities & Demigods (the latter of which got its crunch added to the SRD after a while).
There's a Dragon Magazine issue from around 2004 with darkness as a theme, and an article on Erebor, a god of darkness and shadows, but no Night domain; Erebor just had the Darkness domain. That issue had stuff like darkness pseudo-elementals (or was it shadow pseudo-elementals? whatever), dark ones, some spells using the Plane of Shadow, and a bit else related to the theme.
Exception: That realmshelp page Dandu linked to apparently has a Night domain, but I have no idea what the original source was. And realmshelp is just a pile of stolen non-OGC rules material from various books, without sourcing or permission as far as I can tell, so that site's more or less the same as pirated material. Which I hate with a passion.
And realmshelp is just a pile of stolen non-OGC rules material from various books, without sourcing or permission as far as I can tell

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.