1. A small lamp to keep near your bed. I have a USB cob light with three brightness settings that I got for video recording a few years ago. Turns out, I like it as an anytime light too. I don't think my light produces a natural spectrum, but it seems to help with the onset of short days regardless.
2. Organizers and some stationary. Getting lots of cheap pencil bins, zipper bags, binder clips, manila folders and plastic trays can keep you feeling in control of things around the home if you find you have any disorganized piles of small odds and ends; clip them, bag them, put them in a tray or a bin. Stationary helps focus that because it means you have paper and pencils to store. And stationary is a thing you can apply to studies to make them feel fresh; different pens can give you a different tactile experience when copying information.
3. A pair or two of sturdy gloves for exercise purposes. One of the simplest ways to exercise is to do crawls. Crawling works everything pretty equally, it can get you breathing heavy in a short period and there are lots of variations. You can strap on some weight if you need it to be strength-focused.