The Hippocampus is found in the brain. It is part of the Cerebral Cortex. It is a major component of the brains of humans and other vertebrates. It belongs to the limbic system and plays important roles in the consolidation of information from short-term memory to long-term memory and spatial navigation.
Sleeping and waking depend on activities in the brain stem. Several areas of the brain seem to be involved in dreams and REM sleep, including the hippocamus and cortex. See attached links.
The hippocampus is primarily responsible for memory formation and spatial navigation. It plays a crucial role in converting short-term memories into long-term memories and is also involved in cognitive functions such as learning and emotional regulation.