Cognitive shuffling is a mental technique used to help a person fall back asleep after waking up

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Following Terry Bradshaw's retirement from the NFL, Terry Bradshaw suffered a severe panic attack in Miami that required emergency transport by ambulance

Historian A. Roger Ekirch documented that pre-industrial human sleep was routinely divided into two intervals separated by an awake period called the watch

In historical biphasic sleep, individuals slept for roughly four hours, stayed awake for several hours, and then slept a second phase

Terry Bradshaw underwent three days of brain testing at Yale University, which showed no evidence of dementia or Alzheimer's disease

Subjects placed in pre-industrial lighting conditions naturally revert to biphasic sleep patterns

Human circadian rhythm disruptions and continuous daylight exposure severely impair the production of restorative sleep architecture and neurotransmitters regulating motivation

Testing shows human blood chemistry during the nocturnal waking period of biphasic sleep exhibits hormone levels similar to a lactating mother

Former Pittsburgh Steelers center Mike Webster died after experiencing severe cognitive decline, during which Mike Webster lived out of cars and under bridges

Habituation to cold water and severe sleep deprivation can diminish emotional responsiveness to acute physiological stressors during extreme endurance events

Terry Bradshaw took a one-year hiatus from performing in Branson, Missouri, to undergo hip replacement surgery

Katherine May became seriously ill while writing Wintering and could not finish working out her job notice period

Prolonged exposure to cold water during endurance swimming can induce severe hypothermia, rhabdomyolysis, and cellulitis

After a doctor in Miami recommended immediate heart surgery following Terry Bradshaw's panic attack, Bradshaw snuck out of a hospital in the middle of the night

Following his escape from a Miami hospital, Terry Bradshaw flew to a Fort Worth hospital where angiogram tests showed no arterial blockages

Tim Noakes formulated the central governor theory proposing that the brain regulates exercise performance to prevent catastrophic physiological failure

Terry Bradshaw's Merkel cell carcinoma tumor was discovered during an MRI conducted at Yale University to investigate persistent neck spasms

Terry Bradshaw underwent immunotherapy to treat his diagnosis of bladder cancer

The NFL introduced rules to protect players from head injuries in the late 1980s and 1990s following concussions and player deaths linked to chronic traumatic encephalopathy

Katherine May's husband suffered a ruptured appendix and severe sepsis during the writing of Wintering

Terry Bradshaw survived separate diagnoses of bladder cancer and Merkel cell carcinoma