Sleep unit of study targeted questions Flashcards
(25 cards)
shift work
rhythm out of alignment with the external environment and dark/light cues to align with working shifts at unusual times
Bright light therapy
High intensity artificial bright light, shift works should use this as they are getting ready to leave for work
Explanation of light interacting with SCN
When this bright light hits the retina it sends a message along the optic nerve to the suprachiasmatic nucleus (SCN)
Role of BLT
Make people more alert because bright light hitting the retina would lead to the suprachiasmatic nucleus suppressing the release of hormone meletonin. Therefore leading to less sleepiness
EEG during being awake (normal waking conciousness)
Show higher frequency and lower amplitude brainwaves (more alert) than before BLT being administerd
Sleep is considered a psychological construct because…
It is an entity we know to exist, because we can measure its effects, but we cannot directly measure the entitiy itself.
The three zitegebers:
- Restricting blue light filters
- diet
Room temp -> approx 18.3 degress
Sleep as a psychological construct
An entity we believe to exist, because we can measure its effects, but we cannot directly measure the entity itself.
Charachteristics of REM sleep
The sleeper is considered to have a highly active brain and less active body.
The sleeper is visually paralysed during REM sleep meaning that most muscle movement is not possible.
REM is relatively light stage of sleep, despite the muscle paralysis, the brain is active and sleepers can be woken fairly easily.
Characteristics of NREM sleep
The sleeper is considered to have a less active brain than normal waking consciousness.
As opposed to REM sleep, physical movement is possible in NREM sleep, therefore the body is said to be ‘more active’ in this stage of sleep.
Muscle movement is possible for the sleeper during NREM sleep
EEG shows during REM
higher freq lower amplitude
EEG in NREM stage 1
high freq low amplitude
EEG in NREM stage 2
medium freq and medium amplitude
EEG in NREM stage 3
lower freq and higher amplitude
circadian rhythm
biological and behavioural changes that occur as part of a cycle that lasts around 24 hours.
Ultradian rhythm
biological and behavioural changes that occur in a cycle that lasts less than 24 hours.
suprachiasmatic nucleus
Input of external and internal cues to SCN-> SCN receives cues-> SCN sends appropriate signals to pineal gland-> pineal gland releases hormones based on SCN signalling -> the hormone melatonin is released at night time to induce sleep
Affective effect of sleep deprivation
poor emotional regulation, irritability and moodiness, increase in negative emotions
Behavioural effect of sleep deprivation
Excessive sleepiness during the day, increased likelihood of engaging in risk taking behaviours, slowed reaction time.
Cognitive effect of sleep deprivation
Reduced concentration, lapses in attention, impaired decision making processes and problem solving abilities.
Circadian rhythm sleep disorders
sleep disorders that interfere with the typical regulation of the circadian rhythm, of sleep, leading to a change in the sleep-wake cycle
BLT for DSPS
- BLT in the morning
- act as an external cue to the SCN and promote wakefulness, by sending signals to release cortisol
- Help the SCN send signals for melatonin release at an earlier more appropriate sleeping time
BLT for ASPD
- evening
- external cue to SCN, promote wakefulness
- SCN signals melatonin
- Signal cortisol release later in the morning
BLT for shift work
- dependent on shift work timings
- generally before their shift
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