Sleep Flashcards
When does non-REM sleep occur?
at the start of the night
What happens biologically during non-REM sleep?
synchronised, rhythmic EEG activity; partial muscle relaxation; reduced cerebral blood flow;
What happens biologically during REM sleep?
EEG shows fast activity- similar to wakefulness; atonic muscles; cerbral blood flow increased; impaired thermal regulation
What is the difference between dreaming in NREM and REM?
in NREM there isnt dreaming per se but there are some non-narrative images whereas in REM there is narrative dreaming
What is the function of REM sleep?
mainly for early brain development which is likely dispensable in adults
What is the normal circadian rhythm length?
25 hours
How is bodyclock reset everydya?
behaviour cues and light- non-rod and non-cone cells are sensitive to certain freq of blue light which resets clock
What happens with lack of sleep?
prefrontal- irritable and suspicious; visual illusions; microsleeps and conc. lapses; doesn’t effect well-rehearsed tasks but does effect lateral thinking
What patients are REM parasomnias seen in?
pre- Parkinson’s
What happens in non-REM parasomnias?
confusional arousals; sleep alking; terros and paralyssi
When are the two peask of onset of narcolepsy?
age 15 and 36
Whta are the symtpoms of narcolepsy?
daytime sleepiness; cataplexy; hypnagog hallucinations; sleep paralysis; RBD
What is cataplexy?
loss of muscle tone triggered by emotion
What are hypnagogic hallucinations?
hallucinations occuring at sleep onset
What is RBD?
REM behviour disorder- loss of muscle atonia during REM
