Do dreams usually have a meaning behind them?

Melissa • 𝟮𝟬𝟮𝟬👧🏻 - 𝟮𝟬𝟮𝟭🧒🏻 & 🤰🏻

Just curious as since I had a car accident (2012) I've had this same dream that was actually a hallucination over and over again. From my coma! Do they usually have any meaning or do they genuinely mean nothing?