At the moment all of my rides are at night and solo.
I do a very similar route so people know where I go. I prefer it at night as there is always the slightly scary, s##t yours pants moments when you realise it was a shadow of a tree rather than a witch on a broom stick!
I tend to ride normally, push myself on hills and come back down at normal speed.
If your lights are good enough, why ride differently?
I have two P7 torches and take 4 batteries out with me along with a phone, ipod, normal tools and rain jacket.
I LOVE IT!