Sleep disorder — what the definition needs
A sleep disorder is a persistent problem with the pattern, timing or quality of sleep, enough to disrupt daytime functioning — such as insomnia or narcolepsy. Each clause earns marks: persistent (not one bad night), pattern/timing/quality, and disrupts the day (the clause most drop). Naming a disorder is creditworthy. The word is explanations, not causes: give the mechanism. "He is stressed" scores little; "stress keeps him aroused, so he lies awake longer" does.
Insomnia — symptoms in three groups
Insomnia — persistently cannot fall asleep, stay asleep, or wakes far too early, despite the opportunity to sleep (not sleep deprivation). Three symptom groups — getting to sleep (long time lying awake), staying asleep (repeated or early waking, unrefreshing sleep) and the next day (tiredness, poor concentration, irritability), where the later marks live. Primary insomnia is the condition itself; secondary is caused by something else, e.g. caffeine.
Narcolepsy — four symptoms, the orexin cause
Narcolepsy — sudden, uncontrollable daytime sleep, no matter how much was slept. Four symptoms: sleep attacks, cataplexy (muscle strength lost, awake), sleep paralysis (briefly cannot move on waking) and hallucinations as sleep begins. The cause: too little orexin from the hypothalamus, which keeps REM inside sleep; without it REM intrudes — muscle inhibition escaping as cataplexy, lingering as sleep paralysis. Plus a genetic contribution.
Evaluating — the lenses that bite here
AO3 is the weakness. Validity: insomnia evidence is often self-reported, and people misjudge how long they lay awake. Reliability: lab recordings repeat, but a strange room is not normal sleep. Generalisability: one narcolepsy case cannot be generalised. Objectivity: a recording is objective, "I felt I never slept" is not. Usefulness: the orexin shortage led to treatments. Balance: narcolepsy has one mechanism, insomnia several overlapping as a cycle.
Drawn from real examiner reports.
Give the effect, not the label
Here candidates name the symptom and stop. "She has cataplexy" is the name, not a description — zero. What scores: "laughing removes her muscle strength while awake, so her legs give way but she stays conscious." The test: cover the technical word — is a person still doing something? If not, it is a label. Identify wants the term; describe/explain wants the effect.
Nov 2021 P2 Q31 records that narcolepsy answers needed the effect not the label; identification without justification is at June 2024 P1 Q11b and Q15b, and the June 2023 and June 2024 P2 summaries record that an explain item must not only describe.
Vague or reworded definitions score zero
Definition marks here are easy and lost to imprecision. "A sleep disorder is how you sleep" names no problem, persistence or effect, so scores nothing. Nor can it be built from the question's own words: "a disorder of sleep" is zero. Give the problem, say it persists, say what it does to the day. Safest is to name insomnia or narcolepsy, which is creditworthy.
June 2024 P2 Q29 records that a definition referencing insomnia or narcolepsy was credited while "it is how you sleep" was not, and June 2023 P2 Q28 records the same on bodily rhythm, where rewording the question or giving only an example scored zero.
Generic answers lose AO2 and the AO3 too
Scenarios carry the AO2 dependency: AO3 is not awarded without AO2, so a generic answer scores 0. Not application: the character's name, repeating the stem, copying a scenario line. Application uses its own detail: "a brightly lit phone in bed until late delays melatonin, so he lies awake." Apply before you evaluate, or the dependency strips the AO3.
The AO2 dependency is at June 2023 P2 Q31 and the June 2022/2023/2024 P2 summaries; the name not counting is June 2022 P1 Q4b and June 2023 P2 Q25; repeating the stem is June 2024 P2 Q10; lifting the scenario is June 2023 P2 Q16.
Not just tiredness, and not fainting
"Narcolepsy is extreme tiredness." No — a sleep/wake boundary failure: sleep comes however much was slept, and REM features escape as cataplexy, sleep paralysis and hallucinations. "Cataplexy is fainting." No — strength is lost, not consciousness. "Insomniacs must try harder." Effort raises arousal and links bed with being awake — part of the problem.
Nov 2021 P2 Q31 records that narcolepsy answers needed the effect rather than the label, and June 2023 P2 Q30 records the mirror-image boundary error, where a benefit of sleep was answered with a disadvantage of sleep loss.
Insomnia is not sleep deprivation
Different things. Insomnia is a persistent inability to sleep despite having the opportunity — hours available, still awake. Sleep deprivation is not being given the time or chance to sleep (a night shift, a new baby). Test: remove the obstacle and the deprived person sleeps, but the insomniac still lies awake. Calling a kept-up parent "insomnia" is the error.
Cataplexy is not fainting
Cataplexy and fainting are confused. Cataplexy is a sudden loss of muscle strength from strong emotion, the person fully conscious throughout. Fainting is a loss of consciousness. What is lost differs — strength versus awareness — so name the emotional trigger and the kept consciousness, not "she fainted."
Symptoms of the disorder, not of poor sleep
Asked for the symptoms of a sleep disorder, some give the general disadvantages of not sleeping. But the question asked what the disorder does, not the effects of one poor night. Keep it on the disorder: for insomnia the three symptom groups, for narcolepsy the four symptoms. The mirror error is answering "a benefit of sleep" with a disadvantage of sleep loss.
June 2023 P2 Q30 records the mirror-image boundary error, where a benefit of sleep was answered with a disadvantage of sleep loss.
Light and melatonin — say what the light does
On a sleep-hygiene scenario the light route scores: in darkness the pineal gland releases melatonin; light late holds it back, so sleep is delayed. Two marks need the pineal gland and melatonin — light suppressing it, not being "tricked into daytime".
The 9-mark Assess — structure for 7-9
The 9-mark Assess is AO1/AO2/AO3 each 3; the 7-9 band is lost to weak AO3. Define the disorder; give two explanations with mechanisms; tie each to scenario detail; weigh for and against; conclude with a judgement (biology suits narcolepsy more). Prose, not bullets.
Match the command word before you write
Read the command word first. State or identify wants the term only; describe or explain wants the effect on the person; define wants the meaning. "State one feature" answered with a full definition, or "explain" met with a bare label, loses marks.
Two unique points; connective for difference
A two-mark describe needs two unique points: "he cannot sleep" twice is one symptom, so add a new group or a daytime effect. A difference needs a connective (whereas, while): two definitions side by side leave it implicit, capped at one mark.
Two disorders, examined by letter: a. insomnia, b. narcolepsy. For each you need its symptoms and its explanations.
Sleep disorder — a persistent problem with the pattern, timing or quality of sleep, serious enough to disrupt normal daytime functioning, such as insomnia or narcolepsy.
Insomnia — a sleep disorder in which a person persistently has difficulty falling asleep, staying asleep, or wakes far too early and cannot get back to sleep, despite having the opportunity to sleep.
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