SLEEP Flashcards

1
Q

Sleep is characterized by

A

Altered consciousness.
Minimal motor & sensory activity.
Specific pattern of brain activity.
Reduced interactions with the external world.

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2
Q

what is electroencephalography

A

is an electrophysiological monitoring method to record electrical activity of the brain, with electrodes placed along the scalp.

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3
Q

emg is used to

A

Monitor sleep stages & diagnose sleep disorders (Polysomnography).
Diagnose neurological disorders (e.g. epilepsy, encephalopathies, stroke…).
Monitor coma, brain death and anesthesia level

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4
Q

brain wave when highly alert and eyes open

A

low ampltude and high frequency

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5
Q

brain wave when ayes closed and relacx

A

low amplittude and high frequency

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6
Q

brain wave during drowsy

A

high amplitude and low frequency

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7
Q

brain wave during deep sleep

A

high amplitude and low frequency

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8
Q

what are the 2 states of wakefulness

A

active: eye open, activate state
resting wakefullness: eye closed, relaxed state

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9
Q

2 state of sleep

A

Non-rapid eye movement sleep (non-REM): composed of 4 stages:
Stage I
Stage II
Stage III
Stage IV
rapid eye-movement (REM) sleep

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9
Q

2 state of sleep

A

Non-rapid eye movement sleep (non-REM): composed of 4 stages:
Stage I
Stage II
Stage III
Stage IV
rapid eye-movement (REM) sleep

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10
Q

wave during wakefulness

A

Beta & Alpha waves: high EEG frequency (9–30 Hz) & low EEG amplitude (∼30 µV).

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11
Q

wave during stage 1 sleep weakfulness

A

Theta waves: intermediate EEG frequency (5–8 Hz) & intermediate EEG amplitude (50 – 100 µV) and K-Complex (isolated slow wave).

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12
Q

wave during stage 2 wakefulness

A

Theta waves and sleep spindle: high EEG frequency (11–15 Hz) & low EEG amplitude (50 µV).

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13
Q

wave of stage 3 and 4 of wakefulness

A

slow waves (delta waves): low frequency (0.5 to 4 Hz) & high EEG amplitude (100 – 150 µV).

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14
Q

REM sleep: Beta & Alpha waves

A

high EEG frequency (9–30 Hz) & low EEG amplitude (∼30 µV). The same as in Wakefulness.

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15
Q

caracteristic of REM sleep (paradoxical sleep)

A

High EEG frequency (10–30 Hz) & low EEG amplitude (∼30 µV), Beta & Alpha waves. The same as in wakefulness,
Rapid eye movements (REM): eyelids closed,
Minimal muscle tone, muscle atonia (i.e. muscle paralysis),
Transient muscle activity (i.e. jerky muscle activity),
Predominance of dreams.

16
Q

how long is approx each sleep cycle

A

90 min and about 4 to 5 cycle per night

17
Q

how does non-REM is throught the night

A

Non-REM sleep is longer at the beginning of the sleep but as the sleeper becomes more rested through the night, the durations of non-REM decrease.

18
Q

how is REM sleep throught the night

A

REM sleep is short at the beginning but becomes long at the end.

19
Q

During wakefulness the cerberal cortex and thalamus are kept excited by

A

neurons of the Ascending Arousal System located at the subcortical level:

20
Q

what composed the subcortical level

A

brainstem, hypothalamus, basal forebrain

21
Q

during wakefulness wakefulness the cortex and thalamus are kept excited by

A

neurons of the Ascending Arousal System located at the subcortical level.

22
Q

cortical neuron discharge AP with which pattern and this result in

A

Cortical neurons discharge APs with fast & irregular patterns (i.e. not at the same time), which results in a low amplitude and fast frequency EEG activity: ‘desynchronized EEG’

23
Q

during wakefulness The arousal system neurons stimulate also

A

motor neurons in the spinal cord to keep a higher muscle tone during wakefulness.

24
Q

during non-rem sleep what happen with inhibitory neurons

A

Inhibitory neurons (mainly GABA) located in the Hypothalamus (Ventrolateral Preoptic nucleus, VLPO) inhibit the neurons of the arousal system to promote sleep.

25
Q

cortical and thalamis neuron switch to what and result to what

A

Cortical and thalamic neurons switch to a slow & rhythmic discharge patterns (i.e. discharge all at the same time), which results in a high amplitude and slow frequency EEG activity: ‘synchronized EEG’ activity (i.e. slow- waves sleep).

26
Q

which neuron are reactivated during REM sleep and what they do

A

the brainstem Acetylcholine neurons are re-activated and send also their descending fibers to excite medullar and spinal inhibitory interneurons, which in turn inhibit spinal motor neurons

27
Q

the inhibition of nmotor neuron in REM sleep lead to what

A

leads to a significant decrease of muscle tone, muscle atonia (i.e. muscle paralysis

28
Q

most of dreaming occurs when

A

during REM sleep

29
Q

what is sleep homeostatic

A

Process S (Sleep Homeostatic): sleep propensity (i.e. sleep need) accumulates across the day:

The more the person stays awake, the more the sleep propensity incerased.

The more the person stays asleep, the more the sleep propensity decerased.

30
Q

what is circadian

A

Process C (Circadian): biological clock, under the control of the hypothalamus:
Follows the light-dark cycle.
Releases sleep-related hormones (e.g. Melatonin).

31
Q

what is circadian

A

Process C (Circadian): biological clock, under the control of the hypothalamus:
Follows the light-dark cycle.
Releases sleep-related hormones (e.g. Melatonin).

32
Q

sleep function

A

sleep is important for physical, cognitive and psychological well-being (i.e. sleep is a vital function):

Resting of different parts of the body.
Restore natural balances among the neuronal centers.
Acceleration of neural maturation (need of sleep for youth).
Facilitation of learning and memory (neuronal plasticity).
Clearance of metabolic waste products generated by neural activity in the awake.
Conservation of metabolic energy.
Hormonal regulation.

33
Q

what is insomnia

A

is a Non-REM Sleep deficiency characterized by a perceived inability to fall and remain asleep at night, although it may not represent a true inability to sleep (paradoxical insomnia = sleep state misperception).

34
Q

what is hypersomnia

A

is a Wakefulness deficiency characterized by excessive daytime sleepiness. It is a failure in the activating of mechanisms that are necessary to maintain arousal during the day.

35
Q

what is narcolepsy

A

is a REM sleep dysfunction seen in the form of sudden REM sleep onset from wakefulness (sleep atacks) and excessive daytime sleepiness. It is often associated with cataplexy (muscle paralysis) following a emotional reaction

36
Q

narcolepsy is caused by what

A

loss of orixin neuron in hypothalamus

37
Q

what is sleep walking

A

is a Non-REM Sleep dysfunction characterized by a partial arousal (with low consciousness) from Non-REM sleep and performing activities that are usually performed during wakefulness (e.g. walking out of the room, eating, sex, driving, homicide…). A total amnesia of the event (i.e. do not recall the event).