What is the identity of element X? 
Definitions:
Deep Sleep
Deep sleep is a stage of sleep characterized by slow brain waves, known as delta waves, and is crucial for physical renewal, hormonal regulation, and growth.
Circadian Rhythms
Changes in physical, mental, and behavioral aspects that adhere to a daily rhythm of 24 hours, mainly influenced by the presence of light and the absence of it in the surroundings of a living being.
Alertness
The state of being watchful, fully awake, and ready to respond to stimuli or challenges that arise.
Brain Wave Patterns
The electrical activity in the brain, as detected by electroencephalography (EEG), which is associated with different states of consciousness.
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