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Understanding Insomnia: Causes, Symptoms & Solutions

Insomnia is a sleep disorder characterized by difficulty falling asleep, staying asleep, or waking too early—despite adequate opportunity—causing daytime impairment. It affects 10–30% of adults chronically.

Common Causes (The "3 P" Model)

  • Predisposing: Genetic, hyperarousal trait, female sex, age >60.
  • Precipitating: Acute stress (job loss, grief, illness), medical hospitalization, medication change, jet lag.
  • Perpetuating: Maladaptive behaviors (time in bed awake, napping, caffeine/alcohol, clock-watching), conditioned arousal (bed = wakefulness), anxiety about sleep.

Medical & Psychiatric Contributors

  • Depression, anxiety, PTSD.
  • Chronic pain, GERD, asthma, COPD, heart failure.
  • Neurodegenerative (Parkinson's, Alzheimer's).
  • Endocrine: Hyperthyroidism, menopause, diabetes.
  • Medications: SSRIs, SNRIs, stimulants, steroids, beta-blockers, diuretics, theophylline.
  • Substances: Caffeine, nicotine, alcohol (rebound), cannabis withdrawal.

Diagnostic Criteria (ICSD-3)

  • Sleep difficulty ≥3 nights/week for ≥3 months.
  • Daytime impairment (fatigue, mood, cognition, performance).
  • Not explained by another sleep disorder (apnea, RLS, circadian).

Evidence-Based Solutions

  1. CBT-I (Cognitive Behavioral Therapy for Insomnia): Gold standard. Components: stimulus control, sleep restriction, cognitive restructuring, relaxation, sleep hygiene. 70–80% response rate, durable.
  2. Sleep Hygiene (Necessary but Insufficient Alone): Consistent schedule, dark/cool/quiet room, no screens 1h pre-bed, limit caffeine/alcohol, regular exercise (not late).
  3. Pharmacotherapy (Short-term/Adjunct):
    • Non-benzodiazepines (zolpidem, eszopiclone) — risk of dependence, complex behaviors.
    • Melatonin receptor agonist (ramelteon).
    • Orexin antagonist (suvorexant, lemborexant).
    • Low-dose doxepin (3–6 mg) for maintenance.
  4. Treat Comorbidities: CBT for anxiety/depression, CPAP for apnea, pain management.

When to See a Specialist

  • Chronic insomnia unresponsive to 4–8 weeks CBT-I.
  • Suspected sleep apnea (snoring, witnessed apneas, unrefreshing sleep).
  • Complex medication regimen.
  • Safety concerns (falls, driving).

Insomnia is treatable. CBT-I is first-line; medications are bridge tools. A sleep medicine physician or behavioral sleep specialist can tailor a plan.

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