GAMEPLAN: Identical to the day-time water wars, but at night. Darkness adds many twists to a once simple game.

NO LIGHT, RIGHT?: The first basic problem with night time water fights is the lack of light. Darkness makes it easier to hide, but harder to see one's targets. Of course, this problem is partly overcome through the use of flashlights, but even those sources of light do not provide as much view as full sunlight. The advantage of this is that flashlights can also be used to momentarily blind an opponent, allowing one to drench them before they drench you. Unfortunately, they can do this also.

UNDER COVER OF DARKNESS: Keeping flashlights off and letting your eyes adjust to the ambient light really lets you approach an opponent more effectively. At night, without light, one's only other real giveaway is sound. Avoid stepping on leaves, twigs or other objects that tend to rattle or crackle. Of course, it is easier if one can see where one is stepping. The other option is to step slowly and lightly in order to minimize noise. The main problem with approaching under cover of darkness is that a well pointed flashlight will not only point out one's position, but also cause temporary blindness, potentially giving the enemy first shot.

THINGS TO BE CAUTIOUS OF: No sunlight means getting sprayed by cold water hurts a little more. That price is also what makes winning in night battles much more satisfying.
The lack of light also makes it simpler for one to accidently trip over objects on the ground, etc. One should always try to watch one's step while looking for one's enemies.

KEEPING TRACK OF TIME: A time limit should really be set with a common meeting point for all players involved. This is important just in case someone does get hurt or lost in the dark. Anyone not showing up at the designated time and place should be looked for by the group.