psych and faith-stages of sleep

N1 stage

low amplitude, mostly high frequencies recorded by EEG

eyes close, muscles relax, core body temperature decreases

how long is N1 stage

1-7 minutes

what are hypnic jerks and what stage do they occur

hypnic jerks are sudden contractions of the muscles and they wake us up, sometimes accompanied by a sense of falling or tripping

it occurs in the N1 stage

N2 stage

characterized by the presence of phenomena on an EKG known as sleep spindles and K complexities, generated in the cortext

K complex involves waves that stand out from the rest of the EEG

eye movement stops, lower heart rate and body temp, muscles tense and relax, upper airways relax

what 2 stages involve drowsiness and light sleep

N1 and N2

N3 stage

known as the slow-wave sleep or deep sleep

Delta waves, which are low frequency and high amplitude waves make up at least 20% of brain activity

what stage is thought to be especially important for overall restfulness, most restorative, and essental for body’s recovery

N3

when does N3 stage occurs?

about 40 minutes after falling asleep

In what stage is muscles paralized

rem stage

which stage has the most vivid dreams, do we dream the most?

rem stage

rem stage

[person passes back through stage 2 and stage 1 before entering rapid eye movement (REM)

EEG activity resembles what’s seen in stage 1, restful waking

how long is the overall cycle of sleep

4-5 times/night

90-110 min

total 7-8 hours

what stage are sleep spindles In and what are they

N2

sleep spindles are 1-2 second bursts of activity and result from interactions between the thalamic and cortical neurons; essential for forming memories and remembering dreams

turn short term memories into long term

sleep spindles

what happens if woken up during N3?

person is groggy and mental performance will be slower for about 30 minutes b/c reduced cerbral blood flow

circadian rythim

our body’s internal clock; regulates body’s sleep and wake cycle

which of the stages was the longest?

N2

why is good sleep so important?

if well rested: enjoy health benefits if sufficient and efficient: through completion of each stage and multiple cycles

if not: fatigued, cognitive impairment, reduced immunity, impacted hormone production, changes in metabolism, reduced concentration & hand-eye coordination, daytime sleepiness, irritability

what do K complexities generated in the cortex help to do?

to not wake up