Broadly speaking, it is an emblem of the mortality of man, as in the
literary examples of Hamlet and Faust. However, like the snail’s shell, it is in
truth ‘what survives’ of the living being once its body has been destroyed. It
therefore comes to acquire significance as a receptacle for life and for thought, it
is with this symbolic meaning that it figures in books on alchemy, where it is
represented as the receptacle used in the processes of transmutation (32). A great
many forms of superstition, ritual and—indeed—of cannibalism, are derived
from this idea.

To see a skull in your dream, symbolizes danger, evil or death. Alternatively, a skull represents the intellect or secrets of the mind. You are keeping certain things hidden.

To dream that a skull is talking to you, suggests that aspects of yourself that you have suppressed or rejected is starting to come back to the surface. These aspects will not be denied any longer and must be dealt with on a conscious level.

To dream that a skull is trying to swallow you, indicates that you are literally being consumed by some danger.

To dream of skulls grinning at you, is a sign of domestic quarrels and jars.
Business will feel a shrinkage if you handle them.
To see a friend's skull, denotes that you will receive injury from a friend because of your being preferred to him.

To see your own skull, denotes that you will be the servant of remorse.

Seeing a skull in your dream, symbolizes danger, evil and death. Alternatively, it represents the secrets of the mind. You may be keeping things hidden.

Dreaming that you are dreaming means your emotional state. You are excessively worried and fearful about a situation or circumstance that you are going through.