Hi. I suffer from Narcolepsy. While I have meds that significantly reduce the disorder's effects, the meds only work for about 12-18 hours. By the end of the day, they've worn off, and I sometimes suffer from micro-nap episodes (imagine falling asleep for ~1-5 seconds several times a minute and having dreams during those "naps"). It can be hard to predict when or if this will happen because it can come on pretty suddenly. When I'm trying to get in a bunch of daily roulettes before going to bed, I'll often go until I either finish or have a dungeon run where it happens to me. Sure, I could stop running dungeons late at night, but I'm not one to let an illness dictate my schedule, and it can be pretty variable when it occurs (sometimes at 10pm, sometimes not until 2am) if it even occurs at all.

When I start having this problem in dungeons, I'll often start running into walls, or backwards, or leroying forward and aggroing stuff I shouldn't be aggroing. I usually catch myself pretty quickly, as there's only so much you can do in 1-5 seconds, but still. I sometimes do get kicked when it happens, especially if it happens multiple times in party-wiping manners, or if I fall asleep for an extended period of time (contrary to the movies, this is rare - micro-nap episodes are much more common, and when it does happen, it usually comes after several micro-nap episodes, not just suddenly out of the blue). But, people have been surprisingly okay about it. "Let's just finish the dungeon" is the usual response to me apologizing for falling asleep.

While I feel really bad about it when it happens, I'm with the OP in not letting a medical condition keep us from playing the game, even if it might cause some inconvenience for others. And, while that stance could be seen as selfish, it's no worse than someone wearing spiritbond gear or being severely undergeared or lacking a key cross-class skill or using a sub-optimal rotation or single-targeting when the tank multi-pulls or single-pulling in easy content or not DPSing as a healer or in any other way playing their role sub-optimally. If I don't have a problem with healers who don't DPS or tanks who don't pull at the right pace, I think its fair for other players to deal with a player running into walls for a few seconds (in my case) or who is sometimes a little slow on skill use (like the OP).