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Evidence-Based Strategies for Clinicians: Addressing the Four Key Factors of Sleep Disturbances

  • Feb 1, 2026
Pure Encapsulations Pro Blog

By Kim Ross, DCN, CNS, LDN, IFMCP+

Evidence-Based Strategies for Clinicians: Addressing the Four Key Factors of Sleep Disturbances

Table of Contents:

The Importance of Sleep

Sleep is not a passive state. It is an active period of metabolic regulation, memory consolidation, immune signaling and cellular repair. Insufficient sleep has been associated with impaired glucose tolerance, reduced insulin sensitivity, altered cytokine signaling, decreased cognitive performance and increased vulnerability to mood changes.1–3

Humans should spend an average of one-third of their lives asleep; however, 50-70 million Americans suffer from chronic sleep disturbances.4 According to the Centers for Disease Control, approximately 35% of adults in the U.S. report sleeping fewer than seven hours per night. Of concern, about 40-50% of your patients are likely to report significant sleep disturbances.5

Improving sleep enhances resilience to stress, improves emotional regulation and supports mood stability and should be considered a nonnegotiable intervention for your patients.6 This blog will focus on the four underlying causes of sleep disturbances and provide practical tips to help your patients achieve restorative sleep.

The Four Underlying Factors of Sleep Disturbances

Circadian Rhythm Dysregulation

Circadian rhythms are daily cycles that regulate everything from body temperature to hormone levels. They’re primarily controlled by the suprachiasmatic nucleus (SCN) in the hypothalamus. The SCN is a tiny region of nerve cells that uses light information from the retina to synchronize our internal clocks with the outside world. Among its functions, the SCN modulates body temperature, cortisol rhythm, melatonin secretion and sleep timing.7 The SCN has two main clocks: a central one that controls sleep and wake cycles, and an external one that is synchronized with the environment. These two clocks work together to help us fall and stay asleep at night and wake up in the morning.

Glycemic Control

Maintaining stable blood glucose and supporting healthy insulin sensitivity are important for promoting uninterrupted, restorative sleep. Fluctuations in glucose, particularly in the evening, can trigger nocturnal dips and trigger a cortisol response that increases nighttime waking and reduces sleep efficiency.

Stress

Stress is an adaptive physiological response intended to maintain homeostasis by activating the hypothalamic-pituitary-adrenal (HPA) axis and releasing cortisol.

Psychological stress and pre-sleep cognitive arousal are among the most common contributors to fragmented sleep and delayed sleep onset. Healthcare providers often focus on supplements or sleep hygiene first, but addressing stress physiology and mental load may produce the most meaningful improvements for some patients.

  Some cognitive and emotional contributors include:
  • Rumination
  • Worry about next-day tasks
  • “Mental clutter”
  • Difficulty disengaging from work, caregiving or digital stimuli

Together, these factors create a state known as pre-sleep cognitive arousal, which interferes with sleep onset and/or sleep efficiency.

Poor Sleep Hygiene Practices

Sleep hygiene is often misunderstood as basic advice. In reality, it is a targeted set of environmental and behavioral strategies that strengthen the circadian signal, reduce nighttime arousal and improve sleep efficiency.

Four Underlying Factors of Sleep Disturbances8–15

Image created in BioRender.com

While this blog addresses four underlying factors, many other root causes may be present.

Other Root Causes of Sleep Disruptions

Sleep Interventions

To determine the best intervention, begin with a clinical assessment of sleep that considers both sleep onset (how long it takes to fall asleep) and sleep efficiency (the proportion of time in bed that is spent asleep). Additionally, take the time to uncover the root cause(s) of your patients’ sleep disturbances.

Realigning Circadian Rhythm

Light exposure remains the primary synchronizer of the circadian rhythm. Research reinforces that both timing and spectral quality of light matter.16,17

  • Adequate daytime (especially morning) light exposure supports more robust circadian entrainment, reduced sleep latency and improved subjective sleep quality.
  • Evening or pre-bed exposure to bright or blue-enriched light is associated with delayed sleep onset, reduced sleep quality and poorer next-day alertness.

For individuals with shift work or irregular schedules, strategic light management (bright light during wake periods; dim or filtered light before sleep) can partially re-align the circadian system and mitigate some of the metabolic and sleep-related risks associated with misalignment.18

Restoring Glycemic Control and Enhancing Dietary Intake

Dietary patterns play a meaningful role in sleep quality, circadian stability and next-day energy regulation. Address one or more of the following dietary factors with your patients, as needed.

Glucose Homeostasis as a Foundation for Sleep Stability

Low-glycemic, whole-food patterns support insulin signaling during the day and night. Changes in glucose metabolism can activate counterregulatory hormones such as cortisol, epinephrine and glucagon, leading to abrupt awakening or restless sleep.

Supporting healthy blood glucose levels through balanced meals, pairing protein with fiber and limiting refined carbohydrates, particularly at dinner, can meaningfully improve sleep continuity.

Individuals who wake during the night due to a drop in glucose may benefit from consuming a small snack before bed to help stabilize glucose response during sleep. Similarly, a small snack upon waking may help promote the return to sleep.

Caffeine Timing

Caffeine is one of the most common dietary contributors to delayed sleep onset and reduced sleep efficiency. Its average half-life is approximately five hours but is variable based on genetics and other factors.19

Patients with sleep difficulty should avoid caffeine after noon, though some patients may require complete elimination. Energy drinks, pre-workout supplements and chocolate are often overlooked sources.
Alcohol and Sleep Fragmentation

Alcohol is sometimes used to self-induce relaxation, yet even moderate evening intake can decrease REM sleep, increase sympathetic activity and lead to early-night sedation followed by late-night fragmentation.20

Recommending that patients cease alcohol at least three hours before bedtime supports more stable sleep cycles.
Protein Intake and Amino Acid Availability

Protein intake throughout the day supports sleep-related neurotransmitter balance. Dietary sources of tryptophan and its cofactors (vitamin B6, magnesium and iron) contribute to melatonin synthesis, but the distribution of protein across meals also influences glycemic stability, which is critical for uninterrupted sleep.

Encouraging patients to prioritize protein at breakfast and lunch can support daytime satiety and reduce evening carbohydrate cravings that may otherwise disturb sleep.
Evening Meal Timing and Composition

Research has demonstrated that the consumption of higher protein, higher carbohydrate and higher fat diets is beneficial to sleep onset and efficiency, working in different mechanistic ways; therefore, personalizing dietary intake is important.21–24

Encourage patients to finish most of their intake earlier in the evening and reserve any late-night eating for truly necessary stabilization (e.g., a small snack for individuals with nocturnal drops in glucose).

Managing Stress

Clinicians sometimes feel uncertain about initiating stress management counseling. It is important to acknowledge and normalize the stressors patients experience. Rather than focusing on excluding or reducing stress, consider strategies to help your patients manage the stress they have.

There are many stress management techniques to consider, so work with your patient to determine which strategies are easiest for them to implement.

Stress Management Strategies to Support Sleep25–27

Improving Sleep Hygiene Practices

Most sleep hygiene practices, properly applied, are a high-yield, low-risk intervention set.

Light

Exposure to bright morning light within 30 to 60 minutes of waking; avoid blue light one to two hours before bed; use blackout curtains; minimize LED lights in the bedroom. 

Pre-bed mobile phone use and other blue light exposure predicted circadian phase delay, poorer sleep quality and worse memory/concentration the next day. Conversely, daytime exposure to bright light or daylight-simulating indoor lighting correlated with earlier sleep onset and better sleep quality.17
Temperature

Maintain a cool room, ideally 60 to 67°F.

Higher environmental and bedroom temperatures are generally associated with poorer sleep quality, including reduced sleep efficiency, increased awakenings and shorter sleep duration.28
Noise

Use white noise if needed; reduce household noise during sleep hours; avoid falling asleep with the television on.
Electronics

Remove TVs from the bedroom; charge phones outside the room; avoid screen use before bed.
Bedding

Choose a supportive mattress and pillows that allow neutral spinal alignment; avoid overly warm bedding.
Pets

Recommend pets sleep outside the bed if nocturnal disruptions occur.
Routine

Maintain consistent bed and wake times daily; create a calming pre-sleep routine; avoid large meals within two to three hours of bedtime.
Environment

Keep the bedroom uncluttered; use low, warm lighting after sunset; avoid working or studying in the bedroom.

Unsure where to begin?


Start with morning light exposure, a consistent wake time, reducing evening light exposure and optimizing bedroom temperature and environment.

Then layer in other support (nutrition, stress reduction and targeted supplements).

Reinforce that improving sleep is about progress, not perfection.

Pure Encapsulations Nutrient Solutions

Circadian Rhythm and Sleep Support

Melatonin supports the body’s natural sleep cycle‡ and helps facilitate the onset of sleep, as well as promotes sleep efficiency‡.29 Available options include Melatonin 0.5 mg, Melatonin-SR, Melatonin 3 mg and Melatonin liquid 30 ml

Suggested Dose: Melatonin 0.5 mg, Melatonin-SR and Melatonin 3 mg: 1 capsule, 30-60 minutes before bedtime; Melatonin Liquid: 1 ml (full dropper), 30-60 minutes before bedtime

Melatonin Dosing: Clinical use of supplemental melatonin ranges widely depending on the intended use. For sleep, doses of 0.3-3 mg are the most studied, with a consensus to start low and increase the nightly dose as needed.29

 

Pure Sleep is for patients requesting a melatonin-free product to promote sleep quality‡. Pure Sleep combines Suntheanine® along with three clinically studied botanical extracts, KSM-66® ashwagandha, valerian root and Affron® saffron, to help patients fall asleep, stay asleep and experience the restorative, restful sleep they need without morning grogginess.

Suggested Use: 2 capsules, 30-60 minutes before bedtime

 

Best Rest Formula contains valerian, passionflower, chamomile, lemon balm and hops, which act to calm and relax the central nervous system; melatonin to facilitate the onset of sleep and promote sleep efficiency; and GABA and l-theanine to promote alpha wave production in the brain, an indication of relaxation.29–32

Suggested Use: 2 capsules, 30-60 minutes before bedtime

Glucose Regulation Support

Metabolic Xtra provides a combination of nutrients to support healthy glucose metabolism and insulin receptor function and signaling‡. It contains 350 mg berberine HCl per capsule, which has been shown to provide statistically significant support for healthy glucose and lipid metabolism.33

Suggested Use: 1 capsule, 1-3 times daily, with meals

Occasional Stress Support

Daily Stress Formula is a blend of botanicals, herbs and other nutrients that supports the body’s resilience when faced with occasional stress.‡ Chamomile and lemon balm promote calmness and relaxation‡, rhodiola supports physical and mental stress‡, and Eleutherococcus senticosus is an adaptogen that helps bolster adrenal function and stress resilience‡.

Suggested Use: 3 capsules daily, with or between meals

 

Cortisol Calm promotes relaxation and healthy cortisol response‡, may support healthy sleep, positive mood and cognitive function‡ and provides support for occasional stress, calm and emotional well-being‡. This formula contains vitamin D and a blend of herbal extracts, including Sensoril ashwagandha, rhodiola, magnolia and l-theanine.‡.

Suggested Use: 1 capsule in the morning and 1 capsule in the evening, with meals

Conclusion

Sleep disturbances are common and often driven by four core factors: circadian rhythm disruption, glycemic changes, occasional stress and mental overload, and poor sleep hygiene. By addressing these root contributors through light exposure, nutrition, stress management and targeted lifestyle changes, clinicians can help patients achieve more restorative, resilient sleep.

Resources

For additional information, including diet and lifestyle recommendations for supporting optimal sleep, refer to the resources listed below:

 

Protocols:

  • Sleep Protocol‡: Designed by our scientific and medical advisors to help you deliver the most effective care and support for sleep.
  • Emotional Wellbeing Protocol‡: Designed by our scientific and medical advisors to help you deliver the most effective care and support for emotional wellbeing.

Webinar:

Blogs:

To learn more about the research on selected nutrient solutions, download the following: 

Drug-Nutrient Interactions Checker: Provides valuable information on potential interactions between your patients' prescriptions, over-the-counter medications and nutritional supplements.

PureInsight™: Our streamlined platform easily collects patient data and provides valuable recommendations to help achieve their health goals.

Virtual Dispensary: Our Pure Patient Direct program provides account holders FREE access to our virtual dispensary to help simplify patient sales and reduce in-office inventory.

You can also explore Pure Encapsulations® to find On-Demand Learning, Clinical Protocols and other resources developed with our medical and scientific advisors.

References

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+Dr. Ross is a paid consultant for Pure Encapsulations.