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Sleep Hygiene: Evidence-Based Ways to Improve Sleep
- Natalia Cajide
- Feb 10
- 6 min read
Updated: Feb 11
Sleep difficulties are common across the lifespan and can affect emotional wellbeing, concentration, physical health, and overall quality of life. Poor sleep is associated with increased stress reactivity, reduced cognitive performance, and difficulties with emotional regulation. While sleep problems are often experienced as frustrating or confusing, research consistently shows that sleep is highly sensitive to daily routines, environmental cues, and behavioural patterns.
Sleep difficulties can arise for many reasons. For some people, they reflect stress, disrupted routines, or changes in daily demands. For others, sleep problems may be a sign of an underlying sleep disturbance such as insomnia, sleep apnoea, or circadian rhythm disorders. Because sleep difficulties can have different causes, it is important not to assume they are always situational or self-correcting.
One of the most effective and accessible first steps in improving sleep is understanding sleep hygiene. Sleep hygiene refers to a set of evidence-based habits and environmental practices that support healthy, restorative sleep.
What Is Sleep Hygiene?
Sleep hygiene refers to the everyday behaviours and environmental conditions that influence sleep quality, timing, and continuity. Rather than focusing on sleep itself, sleep hygiene addresses the factors that either support or interfere with the body’s natural ability to fall asleep and stay asleep.
Key components of sleep hygiene include:
Regular sleep and wake times
Evening routines that promote relaxation
Exposure to light and darkness at appropriate times
Use of substances such as caffeine, alcohol, and nicotine
Timing of meals
The physical sleep environment
Importantly, sleep hygiene is not about rigid rules or achieving perfect sleep. Instead, it aims to create predictable conditions that allow sleep to emerge naturally. Research highlights that responses to sleep hygiene strategies vary between individuals, and that lack of improvement can be clinically meaningful rather than a sign of poor adherence (Urbanová et al., 2023).
Why Is Sleep Hygiene Important?
Sleep is regulated by the circadian rhythm, the body’s internal timing system that coordinates sleep and wake cycles, hormone release, body temperature, and alertness. This system relies on consistent external cues, known as zeitgebers, such as light exposure, meal timing, and daily routines. Light exposure in particular plays a central role in signalling sleep and wake timing to the brain (Czeisler & Gooley, 2007).
When these cues are inconsistent or disrupted, the circadian rhythm can become misaligned, leading to:
Difficulty falling asleep
Frequent night-time waking
Early morning waking
Non-restorative sleep
Improving sleep hygiene helps stabilise these signals, making sleep more predictable and supporting both night-time rest and daytime functioning.
How Much Sleep Do Adults Need?
Most adults require seven to nine hours of sleep per night to support physical health, cognitive functioning, and emotional wellbeing. However, sleep needs vary between individuals, and sleep quality is as important as sleep duration.
Research consistently shows that regularity in sleep timing plays a critical role in maintaining circadian stability. Large changes in sleep timing can disrupt circadian signals and contribute to ongoing sleep difficulties (Czeisler & Gooley, 2007). This can include variations in sleep schedules between weekdays and weekends.
Rather than focusing solely on the number of hours slept, it is often more helpful to aim for consistency and predictability in sleep schedules.
How Do Evening Habits Affect Sleep?
The hours leading up to bedtime have a significant impact on sleep onset and sleep quality. Evening behaviours can either support the nervous system’s transition into rest or increase alertness and physiological arousal.
Research shows that:
Caffeine and nicotine can delay sleep onset and reduce sleep depth, with nicotine in particular associated with sleep fragmentation and reduced sleep quality (Catoire et al., 2021)
Alcohol may initially feel sedating but disrupts sleep later in the night
Heavy or late meals can activate digestion and metabolism, interfering with sleep readiness
Meal timing itself plays a role in regulating circadian rhythms, with later eating associated with shifts in internal timing signals (Wehrens et al., 2017).
In contrast, predictable and calming evening routines help signal safety and rest to the nervous system. Activities such as reading, listening to calming music, or gentle stretching can support this transition when practised consistently.
Does Screen Time/ Light Exposure Impact Sleep?
Evening screen use has become increasingly common and is a frequent topic in discussions about sleep. Light exposure in the evening, particularly from bright screens, can influence circadian timing by delaying signals that promote sleep (Czeisler & Gooley, 2007).
However, screen-related sleep disruption is not caused by light alone. Cognitive and emotional stimulation from work, social media, or engaging content can also increase alertness and delay sleep. A balanced approach focuses on reducing stimulation and light exposure in the hour before bed, rather than eliminating screens entirely.
What Is the Best Sleep Environment?
The sleep environment plays a meaningful role in sleep quality. A bedroom that supports sleep is typically:
Dark, to minimise light-related circadian disruption
Quiet, or with consistent low-level background noise
Cool, within a comfortable temperature range
Comfortable bedding and a supportive mattress can also influence sleep continuity.
Limiting the bed to sleep and rest, rather than work, television, or scrolling, helps strengthen the association between bed and sleep over time. These principles align with public health guidance on healthy sleep environments (Sleep Health Foundation, n.d.).
Can a Warm Shower or Bath Improve Sleep?
Yes. Research suggests that passive body heating, such as a warm shower or bath taken one to two hours before bedtime, can support sleep onset and sleep quality (Haghayegh et al., 2019).
This effect occurs because the body experiences a natural drop in core temperature after warming. This drop acts as a physiological signal associated with sleep initiation and can support the transition into rest when used consistently.
When Is Sleep Hygiene Not Enough?
Sleep hygiene alone is often not sufficient to address persistent sleep difficulties, particularly when problems last longer than three months or involve ongoing night-time waking, early morning waking, or unrefreshing sleep.
Sleep hygiene forms an important foundation, but a lack of response may indicate the need for further assessment rather than stricter routines or increased effort. Research emphasises that sleep hygiene should be individualised, and that ongoing sleep difficulties may reflect factors that require targeted treatment or medical review (Urbanová et al., 2023).
It is important to seek medical advice if sleep difficulties persist despite consistent sleep hygiene practices, or if sleep problems are accompanied by signs that may suggest a sleep disorder. These can include loud or persistent snoring, breathing pauses noticed by a sleep partner, gasping or choking during sleep, excessive daytime sleepiness, morning headaches, or unrefreshing sleep despite adequate time in bed.
Ongoing difficulty falling asleep or staying asleep may also indicate insomnia, which often benefits from structured treatment rather than lifestyle strategies alone.
Key Takeaways: Sleep Hygiene
Sleep hygiene refers to evidence-based habits and environmental factors that support healthy, restorative sleep. Consistent sleep timing, supportive evening routines, appropriate light exposure, and a calm sleep environment help regulate the body’s circadian rhythm and improve sleep quality.
Responses to sleep hygiene strategies vary between individuals. When sleep hygiene is not effective, this information is important and may signal the need for further assessment rather than more effort. Persistent or concerning sleep symptoms should be discussed with a health professional.
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References
Catoire, S., Nourredine, M., Lefebvre, S., Couraud, S., Gronfier, C., Rey, R., Peter-Derex, L., Geoffroy, P. A., & Rolland, B. (2021). Tobacco-induced sleep disturbances: A systematic review and meta-analysis. Sleep Medicine Reviews, 55, 101544. https://doi.org/10.1016/j.smrv.2021.101544
Czeisler, C. A., & Gooley, J. J. (2007). Sleep and circadian rhythms in humans. Cold Spring Harbor Symposia on Quantitative Biology, 72, 579–597. https://doi.org/10.1101/sqb.2007.72.064
Haghayegh, S., Khoshnevis, S., Smolensky, M. H., Diller, K. R., & Castriotta, R. J. (2019). Before-bedtime passive body heating by warm shower or bath to improve sleep: A systematic review and meta-analysis. Sleep Medicine Reviews, 46, 124–135. https://doi.org/10.1016/j.smrv.2019.04.008
Sleep Health Foundation. (n.d.). Sleep Health Foundation: Australia’s leading advocate for healthy sleep. https://www.sleephealthfoundation.org.au/
Urbanová, L., Sebalo Vňuková, M., Anders, M., Ptáček, R., & Bušková, J. (2023). The updating and individualizing of sleep hygiene rules for non-clinical adult populations. Prague Medical Report, 124(4), 329–343. https://doi.org/10.14712/23362936.2023.26
Wehrens, S. M. T., Christou, S., Isherwood, C., Middleton, B., Gibbs, M. A., Archer, S. N., Skene, D. J., & Johnston, J. D. (2017). Meal timing regulates the human circadian system. Current Biology, 27(12), 1768–1775.e3. https://doi.org/10.1016/j.cub.2017.04.059
Disclaimer: The information provided in this blog post is for educational and informational purposes only and is not a substitute for professional psychological or medical advice. The content is intended to support general wellbeing and personal growth, but it may not address specific individual needs. If you have mental health concerns or require personalised support, please consult a qualified healthcare provider. Equal Psychology, Equal Breathwork, Reflective Pathways and its authors are not liable for any actions taken based on this information.
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