What Causes Insomnia? Common Triggers and Simple Ways to Sleep Better

March 27, 2026

Lying in bed, exhausted but unable to fall asleep, can be incredibly frustrating. For some people, insomnia means struggling to drift off. For others, it means waking through the night, getting up too early, or sleeping for hours but still feeling unrefreshed the next day. WHO defines insomnia as a common sleep disorder that can make it hard to fall asleep, stay asleep, or get back to sleep after waking too early, and it can leave you tired during the day.

Insomnia is very common. Healthdirect Australia describes it as a common sleep disorder that can affect your mood and how you think, while the WHO notes that insomnia affects how you feel or function because you aren’t sleeping well or enough. The Sleep Foundation also explains that insomnia often has multiple causes rather than a single, simple trigger.

The good news is that insomnia is often manageable once you understand what may be driving it. Common causes include stress, irregular sleep schedules, poor sleep habits, mental health concerns, physical pain or illness, medications, neurological issues, and other sleep disorders. For many people, it’s a combination of these factors that starts or worsens the problem.

What is insomnia?

Insomnia is more than just having one bad night of sleep. It usually refers to ongoing difficulty falling asleep, staying asleep, or getting good-quality sleep even when you have the chance to sleep. Mayo Clinic notes that adults generally need around 7 to 9 hours of sleep, but insomnia can affect energy, mood, health, work performance, and quality of life. Healthdirect similarly says insomnia can affect mood and thinking.

Not everyone experiences insomnia the same way. Some people mainly struggle when life is stressful, while others have more persistent insomnia linked to habits, health conditions, or other sleep issues. Sleep Foundation notes that both acute and chronic insomnia can be tied to stress, irregular schedules, poor sleep hygiene, mental health disorders, physical or neurological problems, medications, or other sleep disorders.

Common causes of insomnia

The causes shown in your image align closely with those described by major health sources. Here are the most common ones, explained.

1. Stress

Stress is one of the biggest causes of insomnia. Sleep Foundation says common causes of insomnia include stress, and its stress-and-insomnia guidance explains that stress and anxiety often lead to insomnia and can create a cycle where poor sleep increases daytime stress. Cleveland Clinic also identifies stress as a common cause in its insomnia fact sheet.

2. Irregular sleep schedules

When your bedtime and wake time change frequently, your body clock can struggle to settle into a healthy rhythm. The Sleep Foundation lists an irregular sleep schedule as a common cause of insomnia, and Better Health Victoria notes that poor sleep habits and shiftwork can affect sleep.

3. Poor sleep habits and lifestyle factors

Late-night screen use, too much caffeine, alcohol close to bedtime, long naps, and a stimulating bedtime routine can all make it harder to sleep. Mayo Clinic’s treatment guidance advises checking for stimulants in medicines and limiting naps, while Sleep Foundation highlights poor sleeping habits as a common trigger.

4. Mental health conditions

Anxiety, depression, and other mental health conditions can make it much harder to relax and sleep well. Mayo Clinic lists mental health disorders among causes of insomnia and broader sleep disorders, and This Way Up explains that insomnia often overlaps with stress and mental health issues.

5. Physical illness or pain

Pain, illness, breathing problems, chronic health conditions, and discomfort can interrupt sleep or make it difficult to fall asleep in the first place. Mayo Clinic notes that many medical conditions can disrupt sleep, including heart disease, asthma, COPD, and arthritis. Healthdirect also says insomnia can be related to health problems and affects daytime function.

6. Medications

Some prescription and over-the-counter medicines may contribute to insomnia or contain stimulants that interfere with sleep. Mayo Clinic specifically recommends checking whether regular medicines, caffeine, or stimulants like pseudoephedrine may be contributing.

7. Neurological problems

Some brain and nerve conditions can raise the risk of sleep disorders and insomnia. Mayo Clinic notes that conditions such as Parkinson’s disease, multiple sclerosis, and traumatic brain injury may increase the risk of sleep disorders.

8. Other sleep disorders

Sometimes, insomnia is not the only sleep issue happening. Other disorders, such as sleep apnoea or restless legs syndrome, can affect sleep quality and leave you feeling exhausted. Healthdirect says irregular breathing during sleep can be a sign of a sleep disorder, and the Sleep Foundation lists other sleep disorders among the common factors associated with insomnia.

9. Age, hormones, and life stage

Insomnia can become more common with older age, and hormonal changes can also affect sleep. Sleep Foundation lists older age and being a woman or assigned female at birth among insomnia risk factors. Healthdirect also links insomnia resources to pregnancy and breastfeeding information.

What insomnia can feel like

Insomnia is not only about how many hours you sleep. It can also affect how well you function the next day. Mayo Clinic says insomnia can drain your energy, affect your mood, and influence your health and quality of life. Healthdirect says insomnia can affect your mood and how you think.

Common signs may include:

Sleep loss can also become a safety issue. The Sleep Foundation notes that insufficient sleep can increase the risk of car accidents, and poor sleep can affect alertness and daily functioning.

How to improve insomnia: simple steps that may help

Step 1: Identify your likely trigger

Insomnia often has multiple causes. Start by asking:

Am I stressed?
Has my routine changed?
Am I using screens too late?
Is pain, congestion, noise, or snoring waking me up?
Have I started a new medication?

The Sleep Foundation notes that insomnia is often triggered or worsened by a combination of factors, so understanding your personal pattern is important.

Step 2: Keep your sleep schedule steady

Going to bed and waking up at a similar time each day can help support your body clock. Irregular schedules are a known trigger for insomnia, so consistency is one of the simplest places to start.

Step 3: Improve your sleep environment

A room that feels noisy, bright, too warm, or generally unsettled can make it harder to get good sleep. Cleveland Clinic’s insomnia fact sheet recommends establishing a bedtime routine and creating a positive sleep environment.

Product support:
MUTEpodz Ear Plugs may help reduce unwanted noise from traffic, a snoring partner, or a busy household and support a quieter sleep environment.

Step 4: Support comfortable bedtime breathing

If bedtime feels uncomfortable because of blocked nasal airflow, gentle breathing support may help you settle more comfortably.

Product support:
MUTEstripz Nose Strips can be used as a simple nighttime airflow-support option for people seeking more comfortable nasal breathing.

Step 5: Build a calming wind-down routine

Stress and mental tension often keep the brain alert even when the body feels tired. A repeatable bedtime ritual can help signal that it’s time to slow down.

Product support:
Sleep Helper can be introduced as part of a calming, more intentional pre-sleep routine.

Step 6: Review your habits and medicines

Try to reduce late caffeine and alcohol intake close to bedtime, and limit long daytime naps. If you take regular medication, check with your GP or pharmacist whether it could be affecting your sleep. Mayo Clinic specifically recommends checking the ingredients of medicines and stimulants.

Step 7: Be careful with snoring or breathing issues

If your insomnia is tied to loud snoring, choking, gasping, or breathing pauses, it’s important not to assume it’s “just bad sleep.” These symptoms can point to a sleep-related breathing disorder that needs assessment.

Product note:
MUTEtape should be positioned carefully as a bedtime wellness product for suitable users, not as a treatment for insomnia, sleep apnoea, or any medical sleep disorder.

When should you see a doctor?

In Australia, it’s worth speaking with a GP or healthcare professional if insomnia keeps happening, lasts for weeks, or affects your mood, work, concentration, or safety. Healthdirect says insomnia can affect mood and thinking, and Mayo Clinic notes that it can affect health, work performance, and quality of life.

You should seek medical advice if you have:

Ongoing trouble falling or staying asleep
Severe daytime tiredness
Symptoms of anxiety or depression alongside poor sleep
Loud snoring, choking, gasping, or breathing pauses
Pain or illness that is disturbing sleep
Concern that medication may be affecting sleep

Conclusion

Insomnia can be caused by many different things — stress, irregular schedules, poor sleep habits, mental health concerns, pain, medications, neurological issues, and other sleep disorders. For many people, it’s not just one cause but a combination of several.

The most helpful starting point is to understand what may be disrupting your sleep, then work on the basics: