There is neither not self nor self.
The five aggregates; form, sensation, perception, mind formations and consciousness; disperse at death.
Consciousness is life-force. By itself it is without physical form, all types of mental habits, thoughts, ideas, prejudices, compulsions, decisions, familiarity and judgement as to whether an object is pleasant, unpleasant or neutral.
The stream of consciousness passes from one life to another; during this process it is not entirely the same nor entirely different. With the cessation of consciousness samsara ceases.