You must be brave or mad to want to cycle at night, thought only those brave souls who commuted by bike rode in the dark. The main danger is obvious i.e motor vehicles they are dangerous enough in broad daylight . I wouldn't even consider riding in the dark. Get yourself a turbo trainer , much safer
Pants. Indeed, if you have decent lights with reflective kit, I think night time riding is safer than daylight as you stand out more from the background.