When flying at night, flare when your head is inbetween the runway edge lights.
Another advice I got from my instructor was to wait until you could see the runway being illuminated by the landing light (the one located on the engine cowling of a PA28). On our second circuit, the landing light broke down (on downwind) but we didn't notice that until we saw the runway in the glow of the position lights (those weak thingies on the wingtips). To this day I don't know who of us yanked the yoke back first but we did land (rather firmly) on the main wheels, saving the nosewheel, prop etc. ILAFFT.