PSY 4127 Lecture Notes - Lecture 9: Weight Loss, Sleep Onset Latency, Slow-Wave Sleep
4 Jun 2018
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Sleep and Health
Sleep and Infections: good for what ails you.
• incase in sleepiness
• N3 and delta waves increase
• REM decreases during infection (ie. fevers)
• timing o sleep via circadian rhythm is often unaffected
• slow wave sleep is restorative both physically and mentally
• REM decreases when you are sick probably because of heightened body temperature,
lower body temperature is important especially late at night to maintain REM or whatever
• resting and recovering is important just so you don’t spread infection
• can dampen immune response if you have sleep deprivation for even one night
Feedback from the immune system (HIV/AIDS): HIV+ who develops AIDS have daytime
sleepiness, night insomnia, less N3. In final stages of lethargy, daytime sleepiness, no
REM/NREM cycle, N3 almost gone completly. Sleep disturbances predict prognosis.
Stress and Sleep
Acute and chronic stress can both affect sleep stricture. This effects sleep onset latency,
reduced REM latency, reduces % of REM, increases nocturnal awakening, and early morning
awakening with the inability to fall back asleep.
During NREM sleep, growth hormone (GH) is secreted and other hormones from the
hypothalami-pituitary-adrenal (HYPA) system are suppressed. (ex. cortisol)
• this effect is exactly the opposite of the effects of stress
• if sleep is prevented, cortisol secretion will increase, creeping similar effects as stress
Can aggravate the stress and create a vicious cycle. Stress is considered the primary cause of
insomnia, patients with insomnia also tend to have elevated cortisol levels and heart rate.
Animal studies show that recovery from acute stress increases NREM and REM sleep.
Cortisol in HPA axis: during normal sleep cortisol is surpassed and growth hormone is
released. Stress creates the opposite effects.
Pain and Adverse Stimuli: acute or chronic pain reduce slow wave sleep, increase
awakenings from sleep, and increase slow sleep onset latency. Lack of sleep also decreases the
pain threshold, making sleep more difficult — cyclic.
Soothing, familiar, gentle sounds and noises can help sleep, possible some smells.
Exercise
• excessing 4-8 hours before bedtime is beneficial to sleep if core temperature goes up
• slight delays in REM onset
• increases slow wave sleep
• slightly reduces REMS (likely due to temperature)
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Document Summary
Feedback from the immune system (hiv/aids): hiv+ who develops aids have daytime sleepiness, night insomnia, less n3. In final stages of lethargy, daytime sleepiness, no. Acute and chronic stress can both affect sleep stricture. This effects sleep onset latency, reduced rem latency, reduces % of rem, increases nocturnal awakening, and early morning awakening with the inability to fall back asleep. Can aggravate the stress and create a vicious cycle. Stress is considered the primary cause of insomnia, patients with insomnia also tend to have elevated cortisol levels and heart rate. Animal studies show that recovery from acute stress increases nrem and rem sleep. Cortisol in hpa axis: during normal sleep cortisol is surpassed and growth hormone is released. Pain and adverse stimuli: acute or chronic pain reduce slow wave sleep, increase awakenings from sleep, and increase slow sleep onset latency. Lack of sleep also decreases the pain threshold, making sleep more difficult cyclic.
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