Comorbid Depression and Sleep Disorder Case Study
The case hands you its dilemma. CPAP is off the table and polypharmacy is unavoidable, so the work is sequencing decisions under constraints rather than naming a condition.
Editorial process
Last reviewed · August 16, 2026
The dilemma is stated for you — answer that, not the diagnosis
This case is unusual in stating its own dilemma, and that is the thing to answer. Continuous positive airway pressure may not be reasonable for this patient, and polypharmacy is needed but complicated by adverse effects. Everything the assignment asks for — the questions you would put to the patient, the collateral sources, the additional examinations or testing, the differential, the medication review — feeds those two constraints. Start with the relationship the case is built on: depression and sleep disorder are bidirectional, and untreated obstructive sleep apnoea is one of the best-documented reasons an antidepressant fails to work. Treatment-resistant depression in a patient with disrupted sleep is very often not resistant at all — it is being treated while the thing sustaining it goes untreated. Saying that early frames the whole case correctly. Say it in the first two sentences and everything you do afterwards has a reason.
Build the questions from the differential rather than asking generically. You need sleep history in detail: schedule, latency, awakenings, snoring, witnessed apnoeas, morning headache, daytime sleepiness, and what the late-night television is actually doing, since screen exposure and conditioned arousal are treatable causes that require no medication at all. Collaterals matter here because the patient cannot report what happens while she is asleep — a bed partner, an adult child, or a nursing home aide sees what she cannot. For testing, ask what would change management rather than listing everything available. The medication section then needs sequencing: review what she takes now for interactions, sedative load and anticholinergic burden; consider whether a single agent could address more than one target; and prefer cognitive behavioural therapy for insomnia as first-line before adding another drug, because the case's own dilemma is that adding drugs is where the harm is.
Likely learning objectives
Inferred from the brief — check these against your own rubric.
- 01Recognise the bidirectional relationship between depression and sleep disorder.
- 02Build interview questions from a working differential.
- 03Identify collateral sources for information the patient cannot supply.
- 04Sequence treatment decisions under a stated polypharmacy constraint.
Read the full question
Review every instruction before using the planning guidance that follows.
Turn the brief into deliverables
- 01Questions you would ask the patient, tied to differentials.
- 02Named collateral informants and what each could contribute.
- 03Additional physical exams or diagnostic testing, with what each would change.
- 04Differential diagnoses referenced to DSM-5 criteria.
- 05A medication review addressing interactions and adverse effects.
- 06A treatment plan that respects the case's stated constraints.
Questions, collaterals, testing, differentials, then the medication problem
The relationship between the two conditions
Establish bidirectionality and what it implies about resistance.
Questions for the patient
Build a targeted sleep and mood history.
Collateral sources
Identify who can report what the patient cannot.
Examination and testing
Select investigations by what they would change.
Differential diagnoses
Work through DSM-5 criteria for the plausible conditions.
Medication review and plan
Address interactions, sedative burden and sequencing.
Sleep medicine guidance alongside the psychopharmacology
Recommended databases
- American Academy of Sleep Medicine
- NCBI Bookshelf
- PubMed Central
- Stahl's Prescriber's Guide
Search sequence
- 1.Read the current insomnia treatment guideline before proposing any medication.
- 2.Check the interaction and adverse effect profile of each drug she already takes.
- 3.Look up the evidence on untreated apnoea and antidepressant response.
- 4.Confirm DSM-5 criteria rather than working from recollection.
Reference shortlist
These are authoritative starting points, not a ready-made bibliography. A qualified reviewer must confirm that each source fits the assignment and supports the claim beside which it is cited.
Nothing here is cleared for citation until you have read it.
- 01
Combination treatment for chronic insomnia disorder in adults: an American Academy of Sleep Medicine clinical practice guideline
Journal of Clinical Sleep Medicine, American Academy of Sleep Medicine · 2026
The current clinical practice guideline on combination treatment for chronic insomnia.
- 02
Pharmacotherapy Treatment Options for Insomnia: A Primer for Clinicians
International Journal of Molecular Sciences · 2015
A clinician's primer on insomnia pharmacotherapy, including what each agent costs in adverse effects.
- 03
Residual effects of zopiclone 7.5 mg on highway driving performance in insomnia patients and healthy controls
Psychopharmacology · 2014
Residual next-day impairment from a hypnotic — the concrete risk behind the polypharmacy warning.
- 04
Sertraline
StatPearls, NCBI Bookshelf, National Library of Medicine · 2023
A worked antidepressant monograph for the interaction and adverse effect review.
- 05
Sexual dysfunction associated with antidepressants and antipsychotics: a structured narrative review
Therapeutic Advances in Psychopharmacology · 2026
Adverse effects that patients stop medication for, which is where adherence questions belong.
Review before submission
Common mistakes
- Treating the depression as resistant without investigating the sleep disorder.
- Listing every possible test rather than those that would change management.
- Adding a hypnotic without considering behavioural treatment first.
- Ignoring the stated dilemma and proposing CPAP anyway.
Submission checklist
- Does every question you list connect to a differential?
- Have you named who could report on her sleep?
- Does each test have a stated consequence for management?
- Does the plan work within the CPAP and polypharmacy constraints?
Use this guide to plan and review your own work. Follow your institution's rules and read our academic-integrity policy.

Written by
Aaron Bishop
MA, Education
assignment interpretation and research-methods coaching across disciplines
Aaron leads the EssayCrackers editorial desk. He works on how assignment briefs are read — what a rubric is actually asking for, and where students most often answer a different question than the one set.

Reviewed by
Dr. Nathan Cole
PhD, Rhetoric & Composition
Argumentation and thesis development
Nathan teaches first-year composition and directs a university writing center. He reviews EssayCrackers guides for argumentative soundness and citation accuracy.