Hiya. This question is more out of pure curiosity than anything else.
Ever since trying alcohol for the first time, I would often close my eyes during inebriation, and feel this really heavy vertigo/dizziness. It's difficult to describe it, but it feels as if I'm spinning backwards vertically. Though not a full spin, more like a 45 degree one, which keeps warping back to the beginning and looping. Once I opened my eyes, it would quickly fade away, sometimes even when I didn't open them. I should also mention, that I only feel this, when I close my eyes.
Now, this has never been an uncomfortable feeling. Instead, it always seems to make me smile and sneer compellingly. I asked my friend, and he said he hasn't felt anything like this when drunk. That made me wonder what exactly it is, that causes this feeling. I'm assuming it's nothing serious as far as health goes, since it doesn't need much intoxication for me to get this sense of "spinning".
I made a quick Google search for this, and stumbled upon the Wikipedia article "(The) Spins". English is not my main language, and I've always been quite a minor alcohol consumer, so I had never heard that term. Is that really the definition I'm describing here? If so, I would like more elaboration on that.
For reference, my physical measurements: I'm 18 years old, 175cm (5'9'') and an average weight of 50kg (110lbs). I've been consuming alcohol for a little over a year, always in moderation, because any more than that and it makes me feel sick.
I said it already, but I wanna address it further, that this vertigo doesn't feel uncomfortable, and I'm asking this only because I'm interested in the human body and mind. As well as small trivial things.
I assumed it was safe to post this here, 'cause I couldn't find any place more fitting than a general Q&A-subforum.
Alcohol has many effects on the body. The one that causes what you are describing has to do with the fluid in the inner ear.
The three canals of the inner ear, with their fluid and hair cells, are what is responsible for our sense of balance. If this is changed in any way, balance and our sense of it are affected.
Alcohol causes the fluid in the inner ear to become temporarily thicker (more viscous). Thus, it moves more slowly when we move our head, and the change in the fluid movements causes us to experience different sensations. Most people describe it as spinning while still or a feeling of moving through a thick substance.
This is also why persons have difficulty standing and balancing when intoxicated. The system that allows us to know where we are in space is messed up. That is why you will see intoxicated people walking leaning to one side. Or while standing, they will continue to lean until they fall down. It is all due to the balance system not being in good working order.
If you want to know more about the workings of the inner ear, look up information on that system. The inner ear has two jobs; the transmission of hearing and the sense of balance.