Delayed Sleep Phase in hEDS

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Delayed Sleep Phase, formally called Delayed Sleep-Wake Phase Disorder (DSP/DSWPD), is a circadian rhythm disorder in which a person’s internal clock is significantly shifted later than societal norms. This makes it difficult to fall asleep and wake up at conventional times. Although DSP affects people of all kinds, it may be especially relevant in people with hypermobile Ehlers-Danlos syndrome (hEDS), a connective tissue disorder associated with chronic pain, fatigue, and autonomic dysfunction. Research on this link is still emerging, but patients and providers should be aware of how DSP may affect sleep quality, mental health, and daily functioning in hEDS.

 

What Is Delayed Sleep Phase?

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Definition and Diagnostic Criteria

• A persistent delay in sleep onset and wake time—usually by 2+ hours

• Difficulty falling asleep before 1–2 a.m., despite efforts to do so

• Difficulty waking in time for work, school, or appointments

• Normal sleep quality and duration when following personal schedule

• Symptoms must last ≥3 months and cause social or occupational impairment

• Diagnosed using:

  • Sleep diary and/or actigraphy (7+ days, including weekdays and weekends)

  • Optional: dim light melatonin onset (DLMO) testing

 

Common Symptoms

• Trouble falling asleep at desired times

• Oversleeping or sleeping into the late morning/early afternoon

• Daytime sleepiness

• Impaired attention, memory, and mood due to sleep restriction

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Prevalence

Although no large-scale epidemiological studies have specifically quantified the prevalence of DSP/DSWPD in people with hEDS, clinical evidence and case reports suggest that delayed sleep phase is a significant and underrecognized issue in this population. In pediatric hEDS cohorts, studies have documented high rates of sleep disturbances, including delayed sleep onset, poor sleep quality, and difficulty waking—core features of DSP—even if the diagnosis is not formally coded. 

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Clinical consensus and patient self-reports frequently describe a pattern of delayed sleep timing in hEDS, particularly in adolescents and young adults. In addition, theoretical models strongly support an elevated risk of DSP in hEDS due to the overlap of chronic pain, autonomic dysfunction, anxiety, sensory sensitivity, and behavioral adaptations to illness—all of which are known contributors to circadian disruption. Thus, while direct prevalence data are lacking, the evidence from case reports, clinical observation, and mechanistic pathways supports the conclusion that DSP is likely more common in hEDS than in the general population.

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What May Contribute to DSP in hEDS

• Chronic pain interfering with falling asleep

• Anxiety and hyperarousal delaying nighttime relaxation

• Fatigue and reduced activity lowering exposure to natural circadian cues

• Autonomic dysfunction disrupting sleep-wake regulation

• Behavioral adaptations (e.g., screen use, irregular schedules)

• Possible mast cell activation contributing to nighttime symptoms

• No direct genetic link known—but overlapping heritability is possible

 

Pediatric Considerations

• Children and teens with hEDS often show

  • Delayed sleep timing

  • Insomnia and middle-of-the-night awakenings

  • Hypersomnia or sleeping into late morning

  • Excessive daytime fatigue

• These issues can impact

  • School attendance

  • Academic performance

  • Social engagement

  • Emotional development

• Sleep disorders in this age group are often underdiagnosed but have major functional impacts

 

Effects of DSP/DSWPD on People with hEDS

• Increased fatigue and poor daytime functioning

• Poor academic or job performance due to late wake times

• Exacerbated mood symptoms (anxiety, depression)

• Decreased participation in therapy or daily responsibilities

• Worsened pain perception due to poor sleep quality

• Disrupted social life and feelings of isolation

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Diagnostic Tools for DSP in hEDS

• Sleep diary

  • Patient keeps daily log of bedtime, wake time, and sleep quality

  • Minimum of 7 days including both weekdays and weekends

• Actigraphy

  • Wrist-worn device tracks rest/activity cycles

  • Objectively documents sleep-wake pattern

• Dim Light Melatonin Onset (DLMO)

  • Measures timing of melatonin release

  • Confirms biological clock is delayed

  • Optional, but useful when diagnosis is unclear

• Clinical evaluation should include

  • Sleep history and patterns

  • Functional impairment

  • Other comorbid sleep disorders (insomnia, OSA, PLMD)

  • Psychiatric screening (anxiety, depression, ADHD)

 

Treatment Strategies for DSP in People with hEDS

 

Evidence-Based Approaches (For General Population, Adaptable for hEDS)

• Melatonin

  • 0.3–0.5 mg fast-release taken ~1 hour before desired bedtime

  • Helps signal earlier sleep onset

  • Use lower doses initially to monitor sensitivity in hEDS

• Bright light therapy

  • 2,500–10,000 lux for 30–60 minutes shortly after waking

  • Helps shift circadian clock earlier

  • Use with caution in patients with migraine or light sensitivity

• Gradual sleep-wake schedule advancement

  • Move bedtime/wake time earlier by 15–30 minutes every few days

  • Reinforce consistency, even on weekends

• Sleep hygiene education

  • Avoid screens and bright lights in the evening

  • Keep bedroom dark, cool, and quiet

  • Avoid caffeine and stimulating activities before bed

  • Build daytime structure and activity to reinforce sleep cues

 

hEDS-Specific Considerations

• Chronic pain

  • May need to address pain management before sleep treatment can succeed

  • Consider timing physical therapy and pain medications to avoid evening pain spikes

• Autonomic dysfunction

  • Monitor effects of melatonin on blood pressure

  • Track morning symptoms when adding light therapy

• Psychiatric comorbidities

  • Anxiety or ADHD may complicate adherence to routines

  • Cognitive behavioral therapy may help address sleep-related anxiety

• Pacing and fatigue management

  • Support daytime activity without overexertion

  • Encourage consistent exposure to light and activity cues

• Children and adolescents

  • Consider school start time accommodations

  • Collaborate with schools for individualized education plans (IEPs)

  • Engage parents in supporting routines and structure

 

Summary

Delayed sleep phase (DSP/DSWPD) is a circadian rhythm disorder defined by a significant delay in falling asleep and waking up, often by two or more hours. It is especially relevant to individuals with hEDS, due to overlapping features such as chronic pain, dysautonomia, anxiety, fatigue, and behavioral adaptations to illness. While direct prevalence data are limited, emerging and theoretical evidence strongly suggest that DSP is more common in people with hEDS than in the general population—especially in adolescents and young adults.

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Symptoms include difficulty falling asleep at conventional times, sleeping late, excessive daytime fatigue, and impaired function. Diagnosis is clinical and often includes actigraphy, sleep diaries, and (optionally) melatonin onset testing. Treatment consists of melatonin, light therapy, behavioral schedule shifts, and sleep hygiene—all of which should be adapted to accommodate the specific needs and sensitivities of people with hEDS. A multidisciplinary and individualized approach is essential for effective care.

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