I am a motorcycle commuter and I work the night shift so I ride home every work day at night. I don't change my riding style between night and day. My night riding is freeway and city environment so there is always plenty of ambient light around. If you go out into the country or areas where there is no ambient lighting, I would slow down a bit.
Adjusting the headlight is not a bad idea, but the fact of the matter is motorcycle headlights are just plain crummy.... the collision reconstruction community actually takes the time to map vehicle headlights for their lighting patterns and luminosity at different heights and the intial info is the motorcycle headlight as really bad. So... adjustment is not really going to fix something that is bad to start with. Put all of this another way, don't expect your motorcycle to light up the road like your car does.
I would look at wearing anything that is high vis or has reflective strips on the back.... look at the back of your motorcycle.... one little dinky taillight that can blend in with surrounding environment. A research paper that came out of Europe shows that when it comes to motorcycles, helmet and torso are the most visible to other drivers so anything in these areas that can get you seen in darkness is good.
Little critters that are out and about at night..... cats, small dogs, racoons possums, etc... if you do happen to encounter something of this size... run it over...... don't brake, swerve or slow... just run over small critters. make sure your motorcycle is straight up and down, and you are centered over it and just run it over.... My wife learned this lesson the hard way in some twisties she swerved to avoid a stinking squrriel and almost ran off the side of the road and down an embankments.... she listens to me more now about things having to do with riding..... True story, even the listening part!!!!
Lastly, trust your own instincts..... if you have been driving a car at night you know what the night time environment can be like. that environment is the same no matter what you are driving or riding, so ride in your comfort zone.