Disclaimer: This article is for informational purposes only and isn’t intended to diagnose, treat, or replace professional medical advice. Sleep apnoea is a serious condition that can affect your health and quality of life if left untreated. If you’re experiencing symptoms of sleep apnoea or persistent snoring, it’s strongly recommended that you consult a qualified healthcare professional.
Most of us know what a bad night’s sleep feels like.
You wake up feeling unrefreshed, everyday tasks feel more demanding than usual, and by mid-afternoon your energy, patience, or focus may start to dip.
Poor sleep is incredibly common. Stress, busy lives, changing routines, and health factors can all influence how well we rest.
Understanding the effects of poor sleep on everyday life can be a helpful first step towards recognising patterns in your sleep and how they may be affecting you during the day.
How much sleep do we need?
Sleep needs vary from person to person, but for most healthy adults, around 7–9 hours of sleep per night is recommended by the NHS.1
However, the amount of sleep you get is only part of the picture. Sleep quality matters just as much.
During the night, we cycle through different stages of sleep2 in repeating patterns, usually every 90 minutes. Across a typical night, around 75–80% of sleep is spent in non-REM sleep, with the remaining 20–25% spent in REM (Rapid Eye Movement) sleep.
Non-REM sleep moves from lighter stages into deeper sleep, particularly in the first half of the night. These deeper stages are important for physical restoration, allowing muscles to relax, breathing to become more regular, and key repair and recovery processes to take place.
REM sleep tends to occur in longer periods in the second half of the night. This stage plays an important role in memory, emotional processing and mental recovery, and is when most dreaming occurs.
If sleep is frequently disrupted, even briefly, you may spend less time in these restorative stages. As a result, it’s possible to spend enough time in bed and still wake up feeling tired or unrefreshed.
What can influence sleep quality?
Sleep quality can be affected by a wide range of factors, including:
Stress, anxiety, or a busy mind at bedtime
Irregular routines or shifting sleep schedules
Screen use close to sleep
A sleep environment that’s noisy, bright, or uncomfortable
Snoring and disrupted breathing during sleep can also affect sleep quality. In some cases, these interruptions may happen without fully waking you, even though the effects of poor sleep may still be felt by the body the next day.
How poor sleep can affect your day
Sleep supports many of the body’s essential processes3. During sleep, the brain consolidates memories, regulates emotions, and helps restore energy. When sleep is disrupted or lacks sufficient depth, particularly deeper and REM stages, these processes don’t work as effectively, which can affect how you feel and function during the day.
Focus and memory
During sleep, the brain processes and stores information from the day. Poor or fragmented sleep can interrupt this process, making it harder to concentrate, retain new information, or feel mentally clear – especially during tasks that require sustained attention.
Mood and emotional balance
Sleep plays a role in regulating the brain systems involved in stress and emotional responses. When sleep is disrupted, these systems can become less balanced, which may make you feel more irritable, low in mood, or less able to cope with everyday stress.
Energy levels
Sleep helps regulate hormones linked to energy and alertness. Disrupted or low-quality sleep can interfere with this regulation, leaving you feeling persistently tired or drained, even after what seems like a full night’s sleep.
Decision-making and motivation
Restorative sleep supports clear thinking and judgement. Without it, problem-solving, decision-making, and motivation can take more effort, and tasks that usually feel manageable may start to feel more demanding.
Rather than appearing suddenly, these effects often develop gradually and may become noticeable over time as disrupted sleep continues.
How common are sleep problems?
Sleep difficulties are common, and people can experience them in different ways.
Sleep difficulties don’t always follow the same pattern. They can change over time, vary in intensity, and be influenced by different factors at different points in life.
Making better sleep feel more manageable
Improving sleep doesn’t have to mean changing everything at once. Small, realistic steps can make a meaningful difference over time and help reduce the effects of poor sleep on everyday life.
You may find it helpful to:
Keep a consistent bedtime and wake time, even at weekends, to support your body’s natural sleep rhythm.
Create a calm sleep environment, keeping your bedroom dark, quiet, and comfortable.
Allow time to wind down before bed, limiting screen use and social media where possible, as bright light and stimulating content can make it harder to switch off.
Track your sleep patterns over time, for example by using a wearable device, app, or sleep diary, which may help you notice routines, changes or triggers affecting your sleep.
If snoring is part of your sleep experience, using simple self-assessment tools, such as a snoring assessment or sleep apnoea risk check, can help you better understand what may be affecting your sleep and what to consider next. These tools are designed to support awareness, not diagnosis.
Remember, poor sleep doesn’t automatically mean something is wrong, and many sleep difficulties improve over time or with small changes. However, if you’re ever worried about your sleep, or if tiredness is persistent and affecting your day-to-day life, it’s always important to speak to your GP or a healthcare professional for personalised advice.
