Flashcards in Sleep Deck (19)
What is sleep?
State of unconsciousness from which the individual can be aroused by normal stimuli
What is coma?
State of unconsciousness from which the individual cannot be aroused and doesn't respond to stimuli
What part of the brain does sleep originate from?
Pons (reticular formation)
What other parts of the brain are involved in sleep?
Hypothalamus and it's suprachiasmatic nuclei
What neurotransmitter is released for wakefulness and from where?
Orexin (hypocretin), from the hypothalamus
What hormones are known to be associated with sleep?
How is the level of consciousness assessed in an awake person?
Behaviour, speech patterns and content, reading and writing
What EEG recordings are studied?
What are the main waves patterns that can be seen?
What is the common EEG of a person in a relaxed, awake state?
What is the common EEG of a person who is alert and awake?
Even higher frequency
Asynchronous waves (beta waves)
How are theta waves characterised?
Amplitude can vary enormously
How are delta waves characterised?
How many stages of sleep are there?
What happens as a person moves towards deep sleep?
What is commonly found in sleep deprived subjects?
Cognitive function impairment
Physical performance impairment
What functions does sleep support?
Learning and memory
Clearance of waste products from CNS
Conservation of whole body energy
How does sleep change over a lifetime?
Total sleep time decreases through childhood
Percentage of REM sleep decreases