To dream that you catch something in your dream, suggests that you are in need of or that you need to incorporate that something into your life. Consider the object you are trying to catch and look up its meaning. If you are trying to catch a ball, then it indicates that you want to feel whole or you need to be more well-rounded. If you catch a fish, then it suggests that you need to be more spiritual.
To dream that you are playing catch, signifies your carefree attitude. You are enjoying life. Consider who you are playing catch with. If you are playing catch with mother or father, then it represents your bond and closeness to them.
The dream may also be a metaphor to indicate something that is "catchy" or contagious.