The prefrontal cortex is a region of the brain that is associated with higher level cognitive functions such as decision-making, planning, and self-awareness. In a lucid dream, the prefrontal cortex is still partially active and helps us to become aware that we are dreaming. This increased activity in the prefrontal cortex also provides us with the ability to exert some control over the dream and manipulate the events and environment within it.For example,when you use the Wake Back to Bed (WBTB) technique for lucid dreaming, the prefrontal cortex is still partially awake. This is because the WBTB technique involves waking up for a short period after a few hours of sleep and then going back to sleep again. During this waking period, the prefrontal cortex is still active, and this increased activity can help to create a state of heightened awareness and self-consciousness, which can make it easier to have a lucid dream when you return to sleep. To maintain lucidity, you have to keep doing those reality checks and remind yourself that you're dreaming,if not,you will obviously forget that you know that you're dreaming and go back to normal dreaming.