Sleeping And Dreaming Flashcards
Reasons why we sleep
To keep us safe
Healthy brain
Physically repair
Emotional stability
What happens in stage 1 of the sleep cycle
- light drowsy sleep
- eye moves slowly
- muscle activity slows
- muscle spasms
- alpha brain waves
- 10 percent of the sleep cycle
What happens in stage 2 of the sleep cycle
- lose conscious awareness of the world
- slow theta brain waves
- outburst of rapid brain waves
- 50% of the sleep cycle
What happens in stage 3 of the sleep cycle
- deep sleep
- slow delta waves
- fast and short theta waves
- no eye movement or muscle activity
- hard to wake someone up
- high levels of physical repair
- growth hormones released
- 10% of the sleep cycle
What happens in stage 4 of the sleep cycle
- deep sleep
- slow delta waves
- no eye movement or muscle activity
- hard to wake someone up
- high levels of physical repair
- growth hormones released
- 10% of the sleep cycle
What is stage 5 of the sleep cycle called
Rem stage
What happens in rem sleep
- fast, irregular breathing
- limbs and muscles temporarily paralysed
- fast brain waves, similar to when we are awake
- heart rate and blood pressure rises
- dreaming occurs
- 20% of the sleep cycle
What is an exogenous zeitgeber(neuropsychology)
Features of the external environment that help maintain bodily functions
What do the exogenous zeitgeber and the endogenous pacemaker control
The 24 hour sleep wake cycle
Role of the exogenous zeitgeber and the endogenous pacemaker in sleep
When we are exposed to light it stimulates a neural pathway from our retina to the hypothalamus, here a signal is sent from the suprachiasmatic nucleus to other parts of the brain that control body temperature, hormones etc that help us stay wake or fall asleep
Examples of exogenous zeitgeber
Light, temp, social cues
What is an endogenous pacemaker
Internal biological clocks that help maintain bodily function
What is the role of the pineal gland
To release melatonjn
The role of melatonin in helping us sleep
When night falls the pineal gland releases melatonin which is released in the blood. When melatonin increases we being to feel drowsy and sleepy this last for about 12 hours
What is sleep onset insomnia
Struggling to fall asleep
