Sleep health: Causes of poor sleep and how to improve it
Sleep is one of the most important foundations of overall health. It affects how you think, feel and function each day, yet many people struggle to get consistent, high-quality rest.
If you’re finding it difficult to fall asleep, stay asleep, or wake feeling refreshed, you’re not alone. Sleep issues are common and often influenced by a combination of lifestyle, environmental and physiological factors (1,2).
This guide explains the most common causes of poor sleep and outlines simple, practical ways to improve your sleep health over time.
Why sleep matters
Sleep plays a critical role in both physical and mental wellbeing. During sleep, your body supports processes such as:
- Cognitive function and memory consolidation (3)
- Mood regulation and emotional processing (4)
- Immune system function (5)
- Hormonal balance (6)
- When sleep is disrupted or insufficient, it can lead to fatigue, reduced concentration, and ongoing impacts on overall health (2,7).
Common causes of poor sleep
Sleep difficulties rarely have a single cause. In many cases, they develop from a combination of habits, routines and external factors.
Inconsistent sleep habits
Irregular sleep and wake times can disrupt your body’s internal clock (circadian rhythm), making it harder to fall asleep and wake naturally (8). Simple factors such as late nights, sleeping in on weekends, or inconsistent routines can all impact sleep quality. Building consistent sleep hygiene habits that support better rest can help regulate your sleep cycle.
Screen time and light exposure
Exposure to screens in the evening can interfere with your body’s natural sleep signals. Devices such as phones, tablets and televisions emit light that can delay the release of melatonin, the hormone that helps you feel sleepy (9). Understanding how screen time affects sleep can help you make small adjustments that improve your ability to wind down.
Night-time waking
Waking during the night can be frustrating, especially if it happens regularly or makes it difficult to return to sleep. There are many potential reasons for this, ranging from environmental disruptions to underlying stress or changes in sleep cycles (2). Exploring why you wake up during the night can provide useful insight.
Feeling tired despite sleeping
Getting enough hours of sleep doesn’t always mean you’re getting quality sleep. If you regularly wake feeling unrefreshed, it may be linked to sleep interruptions, poor sleep depth, or lifestyle factors (10). Understanding why you feel tired after sleeping can help identify what might be affecting your rest.
Stress and mental load
Stress is one of the most common contributors to poor sleep. Racing thoughts, heightened alertness and difficulty switching off can all make it harder to fall asleep or stay asleep (11). There is a strong relationship between stress and sleep, with each influencing the other over time (12).
How to improve your sleep
Improving sleep doesn’t usually require a single major change. Instead, it’s often about building consistent habits that support your body’s natural rhythms.
Create a consistent routine
Going to bed and waking up at the same time each day helps regulate your internal clock. Over time, this can make it easier to fall asleep and wake feeling more refreshed (8).
Build a wind-down period
Giving your body time to transition into sleep can improve both how quickly you fall asleep and the quality of your rest. This might include limiting screen use, dimming lights, or incorporating calming activities such as reading or gentle stretching (9).
Support your sleep environment
Your bedroom environment can have a significant impact on sleep quality. Consider factors such as light levels, noise, temperature and thecomfort of your mattress and bedding. Even small adjustments can make a noticeable difference (2).
Manage stress before bed
Finding ways to reduce mental load in the evening can help your body shift into a more relaxed state. Practices such as journaling, breathing exercises, or meditation and sleep quality techniques may support a smoother transition into sleep (11).
Be mindful of daily habits
What you do during the day can affect how you sleep at night. Factors such as caffeine intake, physical activity and exposure to natural light all play a role in regulating sleep patterns (2,8).
At the end of the day (pun intended)...
Sleep health is influenced by a range of interconnected factors, from daily habits to stress levels and your environment. While occasional sleep disruption is common, ongoing or persistent issues that affect your daily life may warrant support from a healthcare professional, who can provide guidance tailored to your individual needs.
For many people, small and consistent changes can make a meaningful difference. Focusing on one area, such as your evening routine or sleep environment, can be a practical place to start when looking to improve sleep over time.
References
1. Australian Institute of Health and Welfare. Sleep problems in Australia.
2. National Sleep Foundation. Sleep Health and Sleep Disorders.
3. Walker MP. Why We Sleep. Scribner; 2017.
4. Goldstein AN, Walker MP. The role of sleep in emotional brain function. Annu Rev Clin Psychol. 2014.
5. Besedovsky L, Lange T, Born J. Sleep and immune function. Physiol Rev. 2012.
6. Van Cauter E, Spiegel K. Sleep and metabolic function. Endocr Rev. 1999.
7. Sleep Health Foundation (Australia). Sleep and health factsheets.
8. Harvard Medical School Division of Sleep Medicine. Circadian rhythms and sleep.
9. Chang AM et al. Evening use of light-emitting devices affects sleep. PNAS. 2015.
10. American Academy of Sleep Medicine. Sleep quality and daytime fatigue.
11. American Psychological Association. Stress and sleep.
12. Kalmbach DA et al. The interplay between stress and insomnia. Sleep Med Rev. 2018.
Disclaimer: This information is not intended to be used as medical advice or a substitute for your own practitioner’s advice, nor is it intended to be used for diagnosis or treatment for any illness/disease.
