To dream of a coffin represents acceptance of change or loss. It can also reflect ideas and habits that are no longer of use and can be buried or given up. You may also be noticing that something in your life is ending or changing for the worse.
In a positive context, a coffin reflects your willingness to move forward. Negatively, a coffin symbolizes self-defeating thinking patterns.
Alternatively, a coffin may reflect an unhealthy preoccupation with death or failure.
To dream of building a coffin represents a progressive movement towards a grim result. You may be noticing how your actions are slowly contributing to a loss of some kind. Something you’re doing isn’t working out.
To find yourself inside a coffin in a dream symbolizes acceptance of defeat, or giving in to your problems. You may feel as though you can’t win or that you’re never going to be able to do something you want ever again.
Coffins can also symbolize thoughts about death. People who think about suicide or death a lot may see coffins in dreams accompanied by a lot red color to reflect the negative emotions associated with those thoughts.
Example: A man once dreamed of being inside a coffin. In real life he lost his job and felt like there was no hope for him. Being in the coffin reflected his acceptance of defeat.
Example 2: A woman once dreamed of building her own coffin. In real life she felt that all her attempts to rebuild a relationship were failing. Building the coffin reflected her feelings about all her failed efforts to rebuild the relationship progressing towards the impossibility of ever rebuilding it.
Example 3: A woman had a recurring dream of being in and listening to people talk about her life. In waking life she was very old and spending a lot of time thinking about her death.