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EEG & EOG & EMG
EEG - measures brainwaves
EOG - measures eye movements
EMG - measures muscle tone
Explain why shiftwork is associated with increased accident risk
Our biology promotes daytime wakefulness and sleep at night. Shiftworkers often work when their bodies are primed for sleep, and sleep when their bodies are primed for wake. This disruption in circadian rhythms results in sleep of reduced duration and quality. Circadian disruption and sleep loss increase accident risk.
What is primary insomnia?
sleeplessness that cannot be attributed to an existing medical, psychiatric or environmental cause (such as drug abuse or medications). Can be treated with CBT, stimulants, drugs
What is sleep?
A change in consciousness or environmental awareness
What are circadian rhythms?
near-24 hour rhythms in functioning. controlled by SCN, prime us to be awake during the day and to be asleep at night.
A single sleep period has a higher value than
split sleep
Circadian rhythms control
sleep wake cycle, body temp, hormone production, alertness/performance
Explain the potential cycle of impairment associated with obstructive sleep apnoea (OSA).
OSA can lead to sleepiness, performance impairment and depressed mood, which in turn, can lead to further health complications. Together, this can influence exercise levels and diet, which can lead to weight gain, which exacerbates OSA.
What causes fatigue?
Time of day/circadian influences
Hours of prior sleep
Work
Social, family, environment, lifestyle factors
What is the SCN, and what is its function?
The suprachiasmatic nucleus (SCN) in the hypothalamus is the primary circadian pacemaker in the body. It keeps our circadian (24 hour) rhythms in functioning synchronised to each other and to the outside light/dark cycle – receiving light input through the eye via the retinohypothalamic tract.
What is the most common sleep disorder?
Obstructive Sleep Apnoea (4% - 1 in 4 adults)
When do you experience SWS and REM?
SWS - first half of the night
REM - second half of the night
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