I'm a student as well, and I just finished building my new standing desk, which is tailor made for my height (see below).

I study in chunks that can last >10 hrs, and I have used the desk for two of these long study sessions. Great results so far: procrastination and time-wasting are way down, and, naturally, focus is up.

One challenge is that I have to constantly remind myself not to shift my weight to either side.

Unexpectedly, the desk encourages posting notes on the wall it faces, which surprised me bc I've never really taken that approach in my studies.

Here it is in all of the messy glory of my study:

I never considered standing in-doors, it is just kind of annoying.

However, to put a different spin on things, have you considered studying while walking? The great polyglot Alexander Arguelles advocates doing one of his language learning techniques called "shadowing" whilst walking in the woods. You listen to a language tape on headphones while simultaneously reading an English translation from the book and repeating the foreign language words out loud -- walking with military posture. Of course, you do need a dependable even path without random sink holes or logs to trip on so that it will be safe to keep your eyes on the book.

I have spent at least 100 hours studying French in this manner, and I think the additional blood flow may contribute to more efficient learning. Better yet, it is pretty much utterly impossible to get off task because the steps keep your rhythm -- it feels as if you MUST stop walking if you want to daydream or muse about something off topic.

I recommend that my students take a 10 minute break every hour to get their heart rate up, flush out their system and re-oxygenate their brains. A static body is not functioning optimally. Whether it is a brisk walk around the block or some heavy lifting, it is the elevated heart rate for 10 minutes that really helps. There are a lot of great study tips in this text with many practical applications: Owners Manual for the Brain

I have gotten into the habit of spending 1/2 the day standing and shifting my weight simultaneously. Previously I used to force myself to sit and was miserable much of the time. Now I feel energized and this through enhanced metabolic rate, circulation of the blood and increased electrical activity in the muscles and throughout the nervous system...all attributable to standing. See someone else's post on 'mobilizations'. Have you read up on the literature re: posture/enhancing alertness through movement and the relationship between posture and mood? If so give me a link si vous plait...

I'm an undergrad too, and I try to stand as much as possible. The desk in my dorm last year had a shelf that was the perfect height to place my computer on so I could use it standing. I'm an art/bio double major, so I can do all my art standing up, but during finals season when I had a bunch of calculus and chem problem sets, I found it was easier to do those sitting down. When that happens, I just make sure to do a lot of walking around and make an effort to be a little more active, even though I know it doesn't negate the effects of all the sitting.

I study on a treadmill. I read years ago that learning is enhanced when both sides of the brain are engaged.

I'm not a student anymore but I went to NAVY bootcamp (failed out because of a medical issue) but it was SOOOOOOOOOO hot in the classrooms that they would suggest standing up in the back of the room if we were having a hard time staying awake. That stuck with me and when I went back to college I started standing up in the back of the lecture halls and class rooms. My professors never seemed to mind and I found I was MUCH more alert and I could fidget at will and my back never seemed to hurt since I wasn't sitting on those cruel metal desk chairs. I only had one professor bitch about it and I just told him I had a bad back and that it helped. He never asked for a note so I just went about my business. It's a great technique.

I'm not a student, but I tend to pace when I'm working out a thorny problem in my head. I also tutor a young girl who has a hard time sitting still, and I've found that if I have her stand or walk around the room while she recites things like spelling words, she learns them better.

I do both! Standing for a few hours and sitting for some more. I have my laptop at my kitchen counter and stand mostly when I get tired I pull up the chair. It's good to do both for me.