If you don't have a pair of fish actively and obviously chasing around like mad spawning, whatever it is you are seeing, I can almost certainly guarantee that they won't be eggs.
The goldfish will stay at the bottom, barely able to move, and will appear bloated. In the final stages of dropsy the fish's scales will stick up and the fish will resemble something that resembles a pine cone.
Well goldfish move their fins of course.
Take your goldfish. They will travel.
If your goldfish is staying at the bottom of the tank a lot, make sure that you test the water for nitrate, nitrite, and ammonia - these should be at zero. In addition, also check the PH level in case this has crashes; it should be at least 7.2, but it can be higher if it is normally stable.
Well there is not a whole lot you can do. I recmend (if you have a plant in the fish's environment) that you move your plant in the fish's direction to kind of get him movine
Betta fish sleep on the bottom of the tank. I've never seen one close its eyes but they will often rest on the bottom when there is no action going on around them. Betta like to be around movement. That is why we have my betta fish in our living room.
Mouse
It could be. If its swelling and you can barely move it, it probably is
One possibility is brake(s) locking up.
Goldfish and other types of fish do sleep. They do not sleep like people because they must keep moving water over their gills in order to breathe, but they do relax and go into a sleep-like state. They will chill on the bottom of the aquarium and won't move much. They will wake up and move around more if you touch them while they are sleeping, or if you turn on a light because they have no eyelids. This is why you should never leave an aquarium light on all night.
The fish may look paler than normal or exhibit lethargic behavior. They also will sit at the bottom and refuse food or may become unable to move. Their breathing will usually be very labored.
Sometimes they do and at others they are pretty well comatose.