Damn you, you stole what I was going to say. Night perception does take awhile to attain. Every single student I taught did one, or both rough landings within the first 5. It's easy to get distracted by "other" lights in the area, focus on what you are supposed to be looking at on landing. Looking down the runway and using that periphial vision of the lights, not what's actually in your landing light, will help you feel your way to the ground.