This time of year is the worst for it – you always get about 3 weeks of utter insanity as the mornings get darker and colder and then the clocks go back.
My commute is a mix of driving, riding or getting the train depending on factors like weather, what I’m doing at work (carrying lots of stuff in = car, going out after work = train and so on) but I’m always extra careful on the bike around now.
Most people don’t do much driving other than the commute and basic errands so as soon as it’s dark in the mornings, it takes them a week to get used to it. Minor things like remembering to turn the lights on (4 cars this morning), finding out that a bulb has blown (far too many one-eyed cars to count this morning!), de-misting the windows… Add in leaves on the road, wet weather, low autumn sun at rush hour time – October / early November is just a nightmare.
See if you can change your commute route for a bit, mix it up to stop it becoming a chore.