I have a particular problem with the short days in November and December.
I don't know how many times I've set out to do a walk of about seven miles or so, and completely forgotten beforehand how early it gets dark in the afternoons at this time of the year, as a result of which I'm hastening, although tired, along the last mile or two in the increasing dusk, feeling just a little panicky inside until I have reached my car.
The best answer, I know, would be to start earlier, but I'm not one of these up at dawn people, I don't get out of bed until the hour starts with an eight, and then I fart about at home getting my gear ready and making sandwiches. Driving to the start of a walk takes thirty to fortyfive minutes, maybe more. My average walking speed is just over two miles an hour, what with keeping stopping to take photos and look at things. Add to that a stop for the sandwiches, plus a similar length of time if there's a pub on my route, multiply that if there's more than one pub, and you can see why I get caught out.