Your Brain on No Sleep: Part 2

Clinicians, Culture, and the Case for Yoga

This post is the Part 2 of "Your Brain on No Sleep" and the fourth in a series leading up to our December 2026 workshop: Better Sleep, Better Outcomes: Evidence-Informed Approaches for Rehabilitation Professionals.

In Part 1 of “Your Brain on No Sleep”, we wrote about the brain's overnight cleaning crew (the glymphatic system) and what happens to emotional regulation when we cut sleep short. But the story does not stop there. Obviously, otherwise there wouldn’t be a Part 2.

Let’s take a look at the other domains of thinking and at the relationship between poor sleep and cognitive functioning.

The Executive Function Cliff:

What Happens to Clinical/Professional Thinking

Sleep deprivation does not impair all cognitive functions equally. The areas hit hardest are often the ones clinicians and professionals rely on most.

Attention and Vigilance

Sustained attention, the ability to maintain focus over time, is especially sensitive to sleep loss. Even a single night of significant sleep deprivation can slow reaction time and impair attentional processing. A 2025 study using auditory brain-response measures found that sleep deprivation was associated with slower cognitive processing and reduced attentional efficiency (Ren et al., 2025).

In clinical life, attentional lapses are not always dramatic. They can look like rereading the same note three times, missing a subtle change in a client’s presentation, or forgetting what you were about to document. The danger is that the lapse may feel minor from the inside while still affecting performance.

Working Memory

Working memory, holding multiple pieces of information in mind while using them, is foundational to clinical reasoning. Think differential diagnosis, medication reconciliation, discharge planning, documentation, and pattern recognition across a complex case.

Sleep restriction produces dose-dependent neurobehavioral impairment, and sustained wakefulness degrades accuracy, vigilance, and cognitive throughput (Van Dongen et al., 2003). In our work lives, that is not merely an efficiency problem. It is a cognitive fidelity problem.

Cognitive Flexibility

Perhaps most concerning for professionals is sleep deprivation's effect on cognitive flexibility, the ability to shift strategies, update your thinking in response to new information, and avoid getting stuck on an initial approach when it’s not working.

A scoping review found mixed results overall, but the pattern was clearest under total sleep deprivation: sleep deprivation consistently reduced task-switching accuracy and cognitive flexibility (Sun et al., 2025). In practice, this means difficulty reconsidering a diagnosis, adjusting a treatment plan mid-course, or seeing the situation from a patient's perspective when your first framework is not working.

Moral Reasoning and Ethical Decision-Making

This one often surprises people. Sleep deprivation does not just impair technical thinking; it may also affect judgment in emotionally and ethically complex situations. Research shows that prolonged sleep deprivation can slow responses to moral dilemmas and alter decision-making in situations that require integrating emotion and cognition (Killgore et al., 2007).

That does not mean sleep-deprived clinicians become "less moral." It means fatigue can make ethical reasoning more effortful, especially in situations that require perspective-taking, emotional regulation, and careful consideration of competing values. Given the ethical weight of clinical decision-making, this deserves more attention than it typically receives.

The Normalization Trap: Why HealthCare providers Are at Particular Risk

Healthcare culture has historically normalized, and even celebrated, sleep deprivation. The "tough it out" ethos and the implicit message that needing sleep is somehow at odds with clinical dedication have shaped generations of practitioners. This is changing, but the legacy remains.

The irony is that the professional culture designed to prepare clinicians to serve patients can also undermine the neurological capacity to do so effectively. Sleep education remains limited across many healthcare training programs. A 2020 review documented major gaps in sleep health literacy among healthcare providers, underscoring the need for education on this topic (Meaklim et al., 2020).

This gap is especially important for physical therapists. Most PTs agree that sleep affects health and rehabilitation outcomes, and many believe they should ask patients about sleep. However, studies show that most PTs receive little or no formal sleep education during PT school or after graduation. In one survey, 93% of physiotherapists agreed that PTs should assess sleep habits and sleep quality, and 88% agreed that addressing sleep may affect PT outcomes, but 75%had no sleep education during PT training and 86% had none after graduation. This means PTs may know that sleep matters, but still lack the training to screen for sleep problems, offer basic sleep-health education, or know when to refer (Al-Sharman et al., 2022; Siengsukon et al., 2015)

There is also a self-perpetuating quality to chronic sleep loss: the less you sleep, the less accurately you may perceive your own impairment. You do not know what you are missing, cognitively or emotionally, because the instrument you would use to assess it is the same instrument that is compromised.

What About Naps, Coffee, and Catching Up on Weekends?

Strategic Napping

Short naps can meaningfully improve alertness and performance in the short term. Generally, naps in the 10- to 20-minute range are less likely to cause grogginess (sleep inertia) than longer naps. However, further research is required to better understand all the outcomes of napping (Hilditch & Dorrian, 2017). Napping is not a replacement for consolidated nighttime sleep, but it is also not nothing. For those who work long shifts or irregular schedules, strategic napping may be a legitimate fatigue-management tool.

Caffeine

Caffeine blocks adenosine receptors, which are involved in building sleep pressure throughout the day. It can improve subjective alertness, but it does not erase sleep debt or fully restore the brain to a well-rested state.

Timing matters. A systematic review found that caffeine can reduce total sleep time and sleep efficiency while increasing the time it takes to fall asleep, with larger effects when consumed closer to bedtime (Gardiner et al., 2023). Caffeine's half-life is commonly estimated around 5 hours, but individual variability is significant. The practical point: that afternoon coffee may still be biologically active when you are trying to fall asleep.

Weekend Recovery Sleep

Recovery sleep can help, and may improve alertness, mood, and some performance measures after a period of sleep restriction. But it should not be framed as a complete eraser of chronic weekday sleep loss.

Irregular sleep timing, sometimes called social jet lag, can create its own physiological stress by repeatedly shifting your sleep and wake schedules. The more honest message: recovery sleep is useful, but a pattern of short weekday sleep followed by a large weekend catch-up is not the same as consistently adequate sleep.

What This Means for Physical Rehab and Wellness, and Why Yoga Belongs in the Conversation

The American Physical Therapy Association adopted a position statement in 2020 recognizing that physical therapists have a role in sleep health, including screening, education, referral, and interprofessional collaboration (APTA, 2020). More recent rehabilitation literature has highlighted a stepped approach to assessing and addressing sleep dysfunction in people with musculoskeletal pain conditions (Shepherd et al., 2026).

This matters for clinicians themselves and for the patients they serve. Patients with persistent pain, post-surgical recovery, neurologic conditions, anxiety, depression, and menopausal transitions all have elevated rates of sleep disturbance, and poor sleep can directly compound the clinical picture. Healthcare providers who understand sleep neuroscience can communicate the stakes of sleep deprivation with authority and empathy — not as generic lifestyle advice, but as a genuine clinical priority tied to pain sensitivity, tissue recovery, immune function, emotional regulation, and mental health.

Where does yoga fit?

As a tool for clients and patients, yoga is a promising sleep-supportive movement practice. A 2024 network meta-analysis found yoga to be among the more favorable exercise modalities for improving sleep quality in middle-aged and older adults, though outcomes varied by population, intervention design, and outcome measure (Gao et al., 2024). Understanding the neuroscience of sleep deprivation helps providers explain why yoga-based interventions may be worth including in a broader sleep-supportive plan.

When adopting a lifestyle to promote sleep, an evening yoga practice of pranayama, mindful movement, and relaxation techniques may help reduce hyperarousal, the state that keeps exhausted, highly stressed people lying awake when they finally have a chance to rest.

The Bottom Line

Sleep deprivation is neither a productivity hack nor a badge of professional dedication. It is a neurobehavioral state with measurable, predictable consequences: impaired attention, slower reaction time, emotional dysregulation, reduced cognitive flexibility, and degraded decision-making, all while subjective awareness of impairment fades.

The glymphatic story adds another layer: sleep appears to provide a critical window for brain waste clearance, and long-term short sleep is associated with an increased risk of adverse cognitive outcomes. The human dementia pathway is still being studied, but the clinical message is already clear enough to matter.

For healthcare providers, understanding this is personally relevant and professionally necessary. Our patients deserve clinicians whose brains are running at full capacity. And clinicians deserve workplaces and cultures that take that seriously.

Coming December 2026: Better Sleep, Better Outcomes — A 19-contact-hour retreat-style workshop for rehabilitation professionals at The Landrove in southern Vermont.

References

Al-Sharman, A., Aldughmi, M., Khalil, H., AlKhawaldeh, H., Siengsukon, C. F., & El-Salem, K. (2022). Knowledge and attitudes of physiotherapists toward sleep: A survey study. Work, 73(2), 739–746. https://doi.org/10.3233/WOR-211039

American Physical Therapy Association. (2020). The role of the physical therapist and APTA in sleep health. https://www.apta.org/apta-and-you/leadership-and-governance/policies/role-pt-apta-sleep-health

Gao, X., et al. (2024). Effects of different types of exercise on sleep quality based on Pittsburgh Sleep Quality Index in middle-aged and older adults: A network meta-analysis. Journal of Clinical Sleep Medicine, 20(7), 1193–1204. https://doi.org/10.5664/jcsm.11106

Gardiner, C., et al. (2023). The effect of caffeine on subsequent sleep: A systematic review and meta-analysis. Sleep Medicine Reviews, 69, 101764. https://doi.org/10.1016/j.smrv.2023.101764

Hilditch, C. J., & Dorrian, J. (2017). A review of short naps and sleep inertia. Sleep Medicine, 32, 176–190. https://doi.org/10.1016/j.sleep.2016.12.016

Killgore, W. D. S., et al. (2007). The effects of 53 hours of sleep deprivation on moral judgment. Sleep, 30(3), 345–352. https://doi.org/10.1093/sleep/30.3.345

Meaklim, H., et al. (2020). Sleep education for healthcare providers: Addressing deficient sleep in Australia and New Zealand. Sleep Health, 6(5), 636–650. https://doi.org/10.1016/j.sleh.2020.01.012

Ren, Z., et al. (2025). The impact of sleep deprivation on cognitive function in healthy adults: insights from auditory P300 and reaction time analysis Frontiers in Neuroscience, 19, Article 1559969. https://doi.org/10.3389/fnins.2025.1559969

Shepherd, M. H., et al. (2026). The pain of poor sleep: A clinician's guide to assessing and addressing sleep dysfunction. JOSPT Open, 4(1), 12–22. https://doi.org/10.2519/josptopen.2025.0198

Siengsukon, C. F., Al-Dughmi, M., & Sharma, N. K. (2015). A survey of physical therapists’ perception and attitude about sleep. Journal of Allied Health, 44(1), 41–50.

Sun, X., et al. (2025). The effects of sleep deprivation on cognitive flexibility: A scoping review. Frontiers in Neuroscience, 19, Article 1626309. https://doi.org/10.3389/fnins.2025.1626309

Van Dongen, H. P. A., et al. (2003). The cumulative cost of additional wakefulness: dose-response effects on neurobehavioral functions and sleep physiology from chronic sleep restriction and total sleep deprivation, Sleep, 26(2), 117–126. https://doi.org/10.1093/sleep/26.2.117