Fill a spray bottle with 9 parts water to 1 part fabric softener. Spray the diluted fabric softener lightly on your couch. Test the static content of the couch. Spray again if the static is still a problem.
Use an antistatic cloth or spray on the couch if static remains. You can find these products at most furniture stores.
Use a humidifier in the room with the suede couch. Static builds up quickly when the air is dry.