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Evidence-Based Reviews


Treatment-resistant insomnia? Ask yourself 8 questions

When insomnia persists, go back to the basics to discover what you might have missed.

Vol. 6, No. 12 / December 2007

Although many patients with insomnia respond to standard treatments, some continue to experience insufficient sleep. When your patient appears “treatment-resistant,” you may be tempted to add another therapy or try an unorthodox medication. But choosing an appropriate next treatment is impossible without first looking back for a rationale:

  • Have you overlooked one of insomnia’s many causes?
  • Have you customized treatment for this patient?
  • Is he or she unaware of behaviors that may be undermining attempts to sleep?

Refreshing sleep may elude some thoroughly evaluated and optimally treated patients, but they comprise a small minority. You can help most chronic insomnia sufferers by re-evaluating their behaviors, comorbidities, sleep-wake cycles, and medications (Table 1).

Table 1

Recommended approach to treatment-resistant insomnia

Evaluation

Review your patient’s 24-hour sleep cycle, sleepiness, and sleeplessness, and note persistent patterns (a sleep log or diary may help)

Re-evaluate stimulating or sedating effects of prescribed and over-the-counter medications, caffeine, and alcohol

Consider:

  • influences on homeostatic sleep drive, such as napping
  • influences on circadian rhythm, such as irregular schedules and advanced or delayed phase tendencies
  • comorbid medical and psychiatric disorders
  • other sleep disorders, such as restless legs syndrome or sleep apnea

Monitor insomnia-related daytime symptoms as key outcome measure

Treatment

Re-address sleep hygiene (Table 2)

Consider cognitive behavioral therapy for insomnia

Consider an FDA-approved medication for insomnia (Table 3), customized to your patient’s symptoms

‘3 Ps’ and 8 questions

Thirty percent of adults experience insomnia at least occasionally, and 10% have persistent insomnia. Women, older persons, and patients with chronic medical conditions such as diabetes mellitus and lung disease have higher insomnia rates than the general population.1

An enormous variety of psychological and physiologic processes may influence sleep (Box 1). Multiple factors may contribute to an individual’s inability to achieve sufficient sleep, and the relative significance of these influences can shift over time. Factors that might trigger an insomnia episode are not necessarily those that maintain sleeplessness.

The “3 Ps” model—which includes predisposing, precipitating, and perpetuating factors—is a valuable framework for evaluating patients with treatment-resistant insomnia (Box 2).2 To help you narrow down the possibilities, consider 8 questions to identify factors that may be perpetuating your patient’s insomnia.

1 Does the patient have realistic goals for falling asleep and remaining asleep?

Patients view insomnia as being unable to sleep when they believe they should be sleeping. To be diagnosed as a disorder, insomnia must have daytime consequences associated with:

  • difficulty falling asleep
  • difficulty maintaining sleep
  • awakening excessively early
  • or experiencing nonrestorative sleep.

Daytime consequences may include fatigue, irritability, poor concentration and memory, difficulty accomplishing tasks, and worry about sleep.3,4

Recommendation. Determine how the patient defines “having insomnia” (there are no absolute thresholds). Ask how he or she is functioning during the day. Those who complain of imperfect nighttime sleep may admit that treatment has helped with the daytime symptoms that prompted them to seek treatment.

If daytime symptoms have diminished, reassure the patient that treatment apparently is helping. Patients are less likely to focus on perceived nighttime impairment when their distress about daytime functioning has eased.

Also determine if the patient has followed recommended treatment. Cognitive-behavioral therapy (CBT) may increase adherence to behavioral changes, sleep hygiene, and medication schedules.

2 Have I identified and optimally managed comorbidities?

Identifying comorbidities that may contribute to chronic insomnia is particularly important because managing these conditions may alleviate the sleep disturbance. Pain or discomfort caused by a medical condition may undermine sleep quality. Certain cardiovascular, pulmonary, endocrine, neurologic, rheumatologic, and orthopedic disorders are associated with insomnia.

Most patients experiencing exacerbations of mood and anxiety disorders suffer insomnia, and many other psychiatric disorders are associated with sleep disruption.

Box 1

Insomnia’s clinical features: Subtypes to consider

Diagnostic subtypes recognized by the American Academy of Sleep Medicine may suggest why recommended treatments have not relieved a patient’s symptoms. Insomnia may be:

  • due to a mental disorder, medical condition, drug or substance
  • adjustment-related (acute insomnia), psychophysiologic, paradoxical, or idiopathic
  • related to inadequate sleep hygiene
  • a behavioral characteristic of childhood
  • organic (due to an unspecified physiologic condition)
  • nonorganic, NOS (not due to a substance or known physiologic condition).

NOS: not otherwise specified

Insomnia may be the chief complaint of a patient with obstructive sleep apnea or restless legs syndrome.

Insomnia often accompanies substance abuse and may continue after the patient stops abusing drugs or alcohol. Abused stimulants and sedatives can worsen sleep quality, and discontinuation can cause acute and chronic sleep disruption.

Recommendation. Treat mood and anxiety disorders independently of insomnia. Minimize pain and discomfort from medical conditions. Address substance abuse, and dispel patients’ notion that alcohol is a sleep aid.

Order sleep laboratory testing for patients at risk for sleep apnea, based on their history, physical exam—including obesity, upper airway anatomy, and neck circumference (collar size ≥17 inches)—and informant reports of snoring and breathing patterns.

3 Is the patient taking medications with stimulating effects?

Because insomnia is highly comorbid with mood and anxiety disorders, patients with insomnia often are prescribed antidepressants. Although some are sedating, antidepressants such as selective serotonin reuptake inhibitors are likely to be stimulating.

Recommendation. When insomnia persists, assess the potential effects of prescribed and over-the-counter (OTC) medications. Consider possible pharmacologic effects of aging that can make patients more sensitive to medications.

Also educate patients about the long-acting effects of caffeine and its varied sources, such as energy drinks and OTC products. Some patients will benefit from completely avoiding caffeine, whereas others may do fine restricting coffee to 1 or 2 cups in the morning. A good general practice is to avoid all caffeine after lunchtime.

Box 2

‘3 Ps’: Framework for evaluating treatment-resistant insomnia

Predisposing factors. Some personalities may be predisposed to insomnia. Persons who tend to be anxious, depressive, or emotionally reactive may be at increased risk for developing insomnia.

Precipitating factors may include situational crises, schedule changes, substance or medication use, and psychiatric, medical, and sleep disorders. A careful history allows you to consider precipitating events.

Perpetuating factors that may reinforce and maintain chronic insomnia include:

  • maladaptive behaviors, such as napping or using alcohol as a sleep aid
  • conditioned hyperarousal, whereby insomnia sufferers experience anxiety and tension associated with preparing for and getting into bed. Sleepless time in bed may reinforce the conditioning, contribute to anxiety and tension, and undermine sleep on future nights.

Source: Reference 2

4 Does the patient’s insomnia have a homeostatic component?

Circadian rhythms and a homeostatic sleep drive are temporally linked in regulating the normal routine of nighttime sleep alternating with day and evening wakefulness.5,6 The sleep drive promotes a sleep-to-waking ratio of approximately 1:2 (an average of 8 hours sleep per 24 hours). Adequate sleep, from the homeostatic perspective, could be achieved during any hours of the day or night.

Acute sleep deprivation may result from extended wakefulness—such as staying up all night to study for an exam. Chronic sleep deprivation may occur during successive 24-hour periods with insufficient sleep. Both patterns are associated with increasing subjective sleepiness and ultimately with cognitive impairment.

The circadian process optimizes sleep to occur at night through entrainment with the photoperiod (daylight exposure). The master CNS timekeeper is coordinated by the tiny paired suprachiasmatic nuclei (SCN) in the anterior hypothalamus, where neurons maintain approximate 24-hour periodicity through complex transcription-translation feedback loops involving several genes. Circadian rhythm is reinforced by SCN control of pineal gland production and secretion of melatonin, which normally:

  • is low throughout the daytime
  • rises during the evening as bedtime approaches
  • plateaus during nighttime sleep hours
  • decreases as the normal morning wake time approaches.

The homeostatic sleep drive accumulates from awakening until sleep occurs again. In the late afternoon and evening, however, homeostatic sleep pressure is opposed by an arousal signal from the circadian system.

Typically, people are more alert in the evening than at any other time in the 24-hour cycle. As bedtime approaches, rising melatonin interacts with SCN melatonin receptors and decreases circadian arousal. Normal sleep onset then can occur rapidly at bedtime, when the homeostatic sleep drive is unopposed.

Nighttime sleep initially is promoted by the homeostatic sleep drive. However, the homeostatic sleep pressure is reversed by sleep and thus decreases as sleep continues during the night. The circadian system promotes minimum stimulation during the latter sleep hours, sustaining total sleep for approximately 8 hours.

Consequences. Individual circadian timing tendencies may affect when people experience alertness and sleepiness and may be associated with persistent complaints of sleep onset difficulty or early morning awakening.7 Napping may reduce the homeostatic sleepiness available to aid bedtime sleep onset. Mismatched homeostatic and circadian processes often prevent shift workers from achieving satisfactory sleep.

Recommendation. Have the patient keep a sleep log to identify the time and duration of sleep episodes throughout the 24-hour cycle. Actigraphy may provide useful information about sleep-wake patterns.

5 Are circadian rhythm patterns contributing to insomnia?

Overlooking circadian rhythms’ effects on insomnia can lead to apparent treatment failure.8 Although the circadian system typically promotes sleep from about 10 pm to midnight until about 6 to 8 am, some individuals have long-standing predispositions for earlier or later sleep episodes.

An advanced circadian phase leads to sleepiness and the ability to fall asleep early in the evening, followed by a tendency to awaken spontaneously relatively early in the morning. In extreme cases, patients with these “lark” tendencies may be diagnosed with advanced sleep phase disorder. Persistent early morning awakening insomnia and sleep maintenance complaints are common.

A delayed circadian phase is associated with inability to fall asleep at a typical late evening bedtime and difficulty awakening at a desired time the following morning. In extreme cases, individuals may sleep from very late at night until the following afternoon. These markedly delayed schedules may be obvious, but the circadian contribution may not be recognized in less severe cases.

People with this predisposition may achieve optimum sleep by following their delayed circadian tendency, but school and work demands often conflict with this approach. They may develop chronic sleep deprivation from late sleep onset coupled with forced morning awakenings. Complaints of chronic difficulty with sleep onset are common.

Recommendation. Have the patient keep a sleep log to demonstrate advanced or delayed circadian phase tendencies. Determine if the patient is a shift worker who is attempting to sleep in the daytime. Consider prescribing ramelteon—a melatonin agonist—and providing strategic bright light exposure:

  • in the evening for advanced circadian phase patients
  • in the morning for delayed circadian phase patients.8

6 Is the patient following appropriate sleep hygiene?

Sleep hygiene will not necessarily cure chronic insomnia, but inattention to basic guidelines (Table 2) can undermine other treatments. When re-evaluating patients with chronic insomnia, give special attention to their alcohol and caffeine intake, regularity of bedtime and wake-up times, meal times, and the bedroom environment. Advise patients to remove televisions from the bedroom, for example.

CBT that is effective for chronic insomnia typically blends sleep hygiene with education, cognitive psychotherapy, and specific instructions regarding bedtime schedules.9,10 Relaxation techniques also may be beneficial.

Recommendation. Consider CBT as an option for all patients with persistent insomnia. Combined CBT and pharmacotherapy also may be effective. Medications may provide rapid relief, but CBT’s benefits may be more durable beyond the treatment period.

Consider consulting with a sleep specialist if the patient has not been evaluated at a sleep center. Some sleep centers offer CBT.

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