Why Can't I Sleep? 10 Common Causes of Insomnia and When to Seek Treatment

Struggling to fall asleep can be frustrating, especially when you feel tired but your mind or body simply will not switch off. For some people, poor sleep is occasional. For others, difficulty getting to sleep, staying asleep or waking too early becomes a regular problem.

Insomnia can affect concentration, mood, energy levels and day-to-day performance. If you regularly find yourself asking “Why can’t I sleep?”, understanding the possible causes can help you work out what to do next.

Below are 10 common causes of insomnia, along with practical steps that may help and guidance on when it may be worth seeking professional support.

What is insomnia?

Insomnia is a sleep problem that can involve:

• Difficulty falling asleep

• Waking repeatedly during the night

• Waking earlier than intended

• Finding it difficult to return to sleep

• Feeling unrefreshed after sleeping

• Tiredness or poor concentration during the day

Almost everyone experiences a bad night's sleep occasionally. Insomnia becomes more concerning when sleep problems are persistent or begin affecting your daytime wellbeing.

There is not always a single cause. Sleep can be influenced by stress, lifestyle, health conditions, medicines, hormones and your sleeping environment.

1. Stress and overthinking

Stress is one of the most common reasons people struggle to sleep.

Work deadlines, financial worries, family responsibilities or major life events can keep your brain alert when you should be winding down.

You may notice that as soon as you get into bed, thoughts start racing.

Stress can also create a cycle where you begin worrying about sleep itself. The more pressure you put on yourself to fall asleep, the more difficult it can become.

Relaxation techniques, setting aside time earlier in the evening to deal with worries and establishing a consistent bedtime routine may help.

2. Anxiety

Anxiety can make it difficult for your body and mind to relax.

People with anxiety may experience:

• Racing thoughts

• Restlessness

• Muscle tension

• A fast heartbeat

• Repeated worrying

• Difficulty switching off at night

Poor sleep can then worsen anxiety the following day, potentially creating an ongoing cycle.

If anxiety is regularly interfering with your sleep or everyday life, speaking to a GP or mental health professional may be helpful.

3. Poor sleep habits

Your daily routine can have a significant impact on your ability to sleep.

Common habits that can contribute to insomnia include:

• Going to bed at very different times each night

• Sleeping late at weekends

• Taking long daytime naps

• Working or watching television in bed

• Spending long periods awake in bed

• Using phones or tablets immediately before sleeping

Maintaining a regular sleep and wake time can help your body develop a more consistent sleep pattern.

4. Caffeine

Coffee is not the only source of caffeine. It can also be found in tea, energy drinks, cola, chocolate and some medicines.

Caffeine is a stimulant and can remain in your system for several hours.

If you are struggling with insomnia, consider reducing caffeine intake and avoiding caffeinated drinks later in the day.

Some people are more sensitive to caffeine than others, so even an afternoon coffee may affect sleep.

5. Alcohol

Alcohol can make you feel sleepy initially, which is why some people use it to help themselves fall asleep.

However, alcohol can disrupt sleep later in the night and may result in more frequent waking or poorer-quality sleep.

Regularly relying on alcohol to sleep can also make sleep difficulties worse over time.

Reducing alcohol consumption, particularly in the evening, may help improve sleep quality.

6. Your bedroom environment

Sometimes the problem is simply that your sleeping environment is not helping you rest.

Consider whether your bedroom is:

• Too hot or too cold

• Too bright

• Noisy

• Uncomfortable

• Frequently interrupted by notifications or electronic devices

A quiet, dark and comfortable sleeping environment can make it easier to fall and remain asleep.

Keeping phones and other distracting devices away from the bed may also help.

7. Menopause and hormonal changes

Hormonal changes can affect sleep, particularly during perimenopause and menopause.

Hot flushes and night sweats may wake you during the night, while hormonal changes can sometimes contribute to mood changes or anxiety that make sleeping more difficult.

Pregnancy and other periods of hormonal change can also affect normal sleep patterns.

If menopausal symptoms are interfering significantly with your sleep, a healthcare professional can discuss possible management options.

8. Pain and physical health conditions

Medical conditions can sometimes make it difficult to sleep comfortably.

Examples include:

• Chronic pain

• Arthritis

• Acid reflux

• Asthma

• Certain heart conditions

• Thyroid disorders

• Conditions causing frequent urination at night

Persistent discomfort can make falling asleep difficult or repeatedly wake you during the night.

In these cases, addressing the underlying health problem is often an important part of improving sleep.

9. Sleep apnoea or other sleep disorders

Not every sleep problem is insomnia.

Obstructive sleep apnoea, for example, causes breathing to repeatedly stop and restart during sleep.

Possible signs include:

• Loud snoring

• Gasping or choking during sleep

• Frequent waking

• Morning headaches

• Excessive daytime sleepiness

Restless legs syndrome can also interfere with sleep by creating an uncomfortable urge to move the legs.

If you think another sleep disorder could be causing your symptoms, seek medical advice rather than trying to treat the problem as insomnia yourself.

10. Medicines

Certain medicines can interfere with sleep.

Depending on the individual, this may include some medicines used for:

• Depression or other mental health conditions

• Asthma

• High blood pressure

• Pain

• Congestion

• Hormonal conditions

The timing of a medicine can sometimes affect sleep as well.

Do not stop or change a prescribed medicine without speaking to a healthcare professional. A doctor or pharmacist may be able to review your medicines and determine whether they could be contributing.

What can I do if I can't sleep?

Simple changes to your routine are often a useful first step.

Try:

• Going to bed and waking up at approximately the same time each day

• Developing a relaxing bedtime routine

• Avoiding caffeine later in the day

• Reducing alcohol

• Avoiding heavy meals immediately before bed

• Getting regular physical activity

• Keeping your bedroom dark, quiet and comfortable

• Avoiding long daytime naps

• Reducing screen use before bedtime

It may also be useful to keep a sleep diary for a week or two. Recording when you go to bed, when you wake up, caffeine and alcohol consumption and how you feel during the day can sometimes reveal patterns.

When should you seek treatment for insomnia?

Consider seeking medical advice if your insomnia is persistent, repeatedly affects your daytime functioning or does not improve despite changes to your sleep routine.

You should also speak to a healthcare professional if you:

• Regularly feel extremely tired during the day

• Frequently fall asleep unintentionally

• Experience loud snoring or breathing interruptions during sleep

• Have significant anxiety or low mood

• Experience persistent pain at night

• Think a medicine may be affecting your sleep

• Have sleep problems that are affecting work, relationships or daily activities

Persistent insomnia may require a more detailed assessment to identify what is contributing to the problem.

What treatments are available for insomnia?

The most suitable insomnia treatment depends on the cause and how long the problem has been present.

Cognitive behavioural therapy for insomnia, often known as CBT-I, may be recommended for persistent sleep difficulties. It focuses on changing thoughts and behaviours that may be maintaining poor sleep.

If another medical or psychological condition is contributing to insomnia, treating that condition may improve sleep.

Medication may be considered in some circumstances following an individual clinical assessment. The appropriate approach will depend on your symptoms, medical history, current medicines and other health factors.

Getting help with insomnia

Occasional sleepless nights are common, but ongoing insomnia does not have to be ignored.

If you regularly find yourself wondering “Why can’t I sleep?”, start by looking at your routine, stress levels, caffeine intake and sleep environment. If the problem continues, professional assessment may help identify the underlying cause and appropriate next steps.

At 24 HR Pharmacy, our online healthcare services provide a confidential way to access information and appropriate clinical support. Where assessment or treatment is suitable, a UK-registered prescriber can review your health information and advise you on the next steps.