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Second wind (sleep)

– Characteristics: – Second wind phenomenon evolved as a survival mechanism. – Allows sleep-deprived individuals to function at a higher level briefly. – Fight-or-flight response […]

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– Characteristics:
– Second wind phenomenon evolved as a survival mechanism.
– Allows sleep-deprived individuals to function at a higher level briefly.
– Fight-or-flight response plays a role.
– MRI studies show heightened brain activity in sleep-deprived individuals.
– Performance enhancement noted in neurobehavioral tests during wake maintenance zone.

– Duration:
– Wake maintenance zone lasts 2-3 hours.
– Individuals less inclined to fall asleep during this period.
– Second wind may lead to prolonged wakefulness after urgent tasks.
– Hypervigilance and stimulation can cause fatigue.
– Infants may experience pain and crying due to disrupted sleep habits.

– Fifth day turning point:
– Individuals feel helplessly sleepy until the fifth day of total sleep deprivation.
– Dubbed the “fifth day turning point” in research.
– All observed individuals experience a second wind on the fifth day.
– Studies confirm the phenomenon of a second wind after extended sleep deprivation.
– Noted as a common experience after multiple days without sleep.

– Causes:
– Second winds can occur due to hormonal fluctuations throughout the day.
– Cortisol peaks in the morning, aiding wakefulness.
– Light levels affect the suprachiasmatic nucleus in the brain.
– Melatonin peaks around 10:30pm, preparing the body for sleep.
– Dopamine buildup counterbalances adenosine, influencing sleep pressure.

– Interactions with medications:
– Hypnotic medications reaching peak levels during wake maintenance zone.
– Early administration may negate effectiveness and cause side effects.
– Users may experience disinhibition or hallucinations if awake.
– Timing of medication crucial for desired effects.
– Medications administered during second wind may have altered effects.

Second wind (sleep) (Wikipedia)

Second wind (or third wind, fourth wind, etc.), a colloquial name for the scientific term wake maintenance zone, is a sleep phenomenon in which a person, after a prolonged period of staying awake, temporarily ceases to feel drowsy, often making it difficult to fall asleep when exhausted. They are the result of circadian rhythms cycling into a phase of wakefulness. For example, many people experience the effects of a second wind in the early morning even after an entire night without sleep because it is the time when they would normally wake up.

A second wind may come more readily at certain points of the circadian (24hr) biological clock than others.

While most "winds" coincide with the 24-hour cycle, those experiencing extended sleep deprivation over multiple days have been known to experience a "fifth day turning point".

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