The water symbolizes both the mind and the soul and the culmination of those two things into what we call emotions. The water is basically a metaphor, in our dreams, for our own emotions, and a boat is our own ability to cross through those emotions and to navigate our own feelings. Sometimes it can seem like a real chore to go through that and it can be really hard to have to keep your emotions in check sometimes, but we do it for the sake of those around us that cannot be forced to suffer through all of our emotional outbursts all the time even though this is sort of the situation that we force them into really pretty often. But that is beside the point, time to get down to brass tacks.
When you dream that your boat is sinking, this is a sign that you have tried and failed to control your emotions. Have you been getting uncontrollably angry lately? Have you been having outbursts of tears or have you been oddly laughing at inappropriate situations. All of these things might happen to you if you have been unable to control yourself lately and the image of a boat sinking in your dreams should be suggestive of that.
If you dream of your boat sinking this is a sign that you need to try harder in the future to control the way you feel. You have not been able to handle yourself the way that you should. Even though sometimes it can be a good thing to express your emotions, when you see a boat sinking in your dreams this is a sign that what you have been doing lately is not the good or constructive kind of emotional expression. You have gone beyond the realm of mere expression and these are now being translated into outbursts. You simply cannot keep control of yourself any longer.
The best dream to have would be one in which you are sailing across a placid ocean. A placid sea is one that shows calm. Your emotions are calm ones and it means that you can rest easy. A turbulent sea means you are having emotional troubles on the inside and as long as your boat stays intact then these emotions will be kept on the inside. They will begin to leak out once your boat sinks, so you would do best not to let this happen to you overall.
To dream that your boat is sinking in a placid sea for some reason, shows that you have a weak constitution. Even though the waters of life have not been particularly testy for you, you are still finding some reason to act as if they are, and it is holding you back. It would be unimaginable to think of what would happen if you were to go through an actual emotional crisis. It would be too much to bear for you and it might break you entirely. Do not let this happen to yourself, you can’t afford it.