1- In everyday life, a mortuary is a frightening place, connected as it tends to be with the trauma of death. When a mortuary appears in a dream, we are usually having to consider our fears and feelings about death.
2- If we are viewing a dead body we may be having to consider a part of ourselves that has died, or perhaps a now defunct relationship.
If we are the body in the mortuary, we may have induced a state of inertia which does not allow us to enjoy life properly.
3- Death and dying, again not necessarily the final calling, but possibly new spiritual awareness.... Ten Thousand Dream Dictionary
To see or dream that you are in a mortuary implies that you are neglecting to use your skills, and are therefore not working to your full potential. It may also symbolize certain negative attributes or qualities that you should change.... Dream Symbols and Analysis
A mortuary may symbolize a spiritual transition phase. We are dead to the old way of life and have new spiritual awareness. When a mortuary appears in a dream, we are usually having to consider our fears and feelings about death.... Dream Meanings of Versatile