I am by no means an expert, so someone else may want to correct me here - I have collegues and nephews with Asbergers.
Seizures, I believe, are a frequently occuring co-morbid condition with Asbergers, rather than considered part of the disease. So around a quarter of people with Asbergers will have some kind of seizures, which can vary a lot from shaking or staring through to blacking out. It varies too much to give you any kind of useful answer though - if in doubt, I would politely ask your co-worker if there are things that people working him should know about his health.
In general, people with Asbergers often miss social cues that we take for granted - they can find it hard to read body language or tone of voice to understand when someone is happy, upset, frustrated etc. Sometimes, sarcasm can be totally baffling. In a workplace, it can help, we've found, for people to know that, as otherwise the person can seem quite rude (e.g. Aspergers Bob gives Alice a long list of things he needs fixed in his PC. Alice good-naturedly says "is that all? Sure you don't want me to rebuild your computer?" Bob, missing the cues, says "Yes, I do.") The condition also often comes with a strong drive to keep everything in order, love of routine, big struggles with change etc. In some people, it will also come with sensory disturbances, so noise problems or air con problems can be difficult. Of course, a lot of people with Asbergers have great strategies for dealing with all this, and no-one would ever know they are on the spectrum.
Some of my favourite people have Asbergers, but that could be coincidence 🙂
Hope this helps,
Alison
