This has an opening called the apical foramen. 
Definitions:
Restorative Processes
Biological and psychological processes that contribute to the maintenance and repair of the body and mind.
REM Sleep
A phase of sleep characterized by rapid eye movements, dreaming, and body atonia; plays a crucial role in emotional regulation and memory consolidation.
Sleepwalk
The act of walking or performing other complex behaviors while asleep, also known as somnambulism.
Norepinephrine
A neurotransmitter and hormone involved in arousal and stress response, also known as noradrenaline.
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