What is insomnia?
Insomnia is defined as sleep problems that occur at least three nights a week and last longer than three months, with noticeable daytime complaints such as fatigue, concentration problems, or irritability. This last criterion is important: those who sleep less but function well during the day do not have insomnia.
Insomnia is not a disease in itself, but a symptom that can have other causes. Stress, worrying, an irregular sleep rhythm, chronic pain, or psychological complaints can all lead to sleep problems. Often, multiple factors are at play simultaneously.
The distinction from a regular bad night is the duration and impact. Everyone occasionally sleeps poorly after a stressful day or when ill. Insomnia is the pattern of bad nights that lasts for weeks or months and affects daily life.
Types of insomnia: acute versus chronic
Acute insomnia lasts less than three months and often has a clear trigger. A significant event, a change in your environment, or a temporary stressor can cause acute insomnia. When the trigger disappears, the insomnia often resolves on its own.
Chronic insomnia lasts longer than three months and usually no longer has a single cause. The sleep problem has become an independent pattern, where the fear of another bad night itself contributes to the problem. This is called conditioning: the bed becomes associated with wakefulness rather than rest.
Within these two main types, there are subcategories. Insomnia with difficulty falling asleep, staying asleep, waking up early, and combinations thereof all occur. Treatment varies by type and underlying cause. Do you mostly wake up between 3 and 4 AM? Then read our article as well.
Causes and risk factors
Stress is the most common trigger for insomnia. When the nervous system does not adequately calm down in the evening, cortisol levels remain too high to fall asleep properly. This is an evolutionary mechanism that once offered protection but is now more of an obstacle in modern life. Want to know more about the relationship between tension and sleep? Read on.
Other common causes include an irregular sleep schedule, excessive screen use in the evening, caffeine and alcohol, a sleep environment that is too warm, too bright, or too noisy, and medical conditions such as chronic pain, reflux, or breathing problems. How your sleep rhythm and your internal clock are connected is explained in this article.
Age also plays a role. Older adults generally sleep lighter and shorter than younger people, and wake up earlier more often. Women experience insomnia symptoms more often than men, partly due to hormonal fluctuations around the menstrual cycle and menopause.
Consequences for health and daily life
Chronic poor sleep has broad consequences. In the short term, these include fatigue, concentration problems, irritability, and reduced performance at work or school. In the long term, chronic insomnia increases the risk of cardiovascular disease, type 2 diabetes, obesity, and depression.
The immune system needs sleep to function properly. Those who consistently sleep too little or too poorly become more susceptible to infections and recover more slowly from illness. Memory consolidation, the storage of new information in long-term memory, also largely occurs during sleep.
The impact on daily functioning is at least as severe for many people with insomnia as the nights themselves. The realization that you don't sleep well and that tomorrow will be another difficult day creates a vicious circle that further reinforces sleep problems.
When to seek professional help?
Seek help from your GP if sleep problems persist for longer than three months, if your functioning during the day is severely impaired, or if you notice that thoughts about sleep are increasingly dominating your mind. The GP can assess whether there is a physical cause and refer you to a sleep specialist or psychologist.
Cognitive Behavioral Therapy for Insomnia, also known as CBT-I, is the most effective proven treatment for chronic insomnia. It focuses on the thoughts and behaviors that hinder sleep. CBT-I is more effective than sleeping pills in the long term and has no side effects.
Sleeping pills can help with acute insomnia in the short term, but are not a solution for chronic sleep problems. They suppress symptoms without addressing the cause and can lead to dependence with prolonged use.
What can you do yourself?
Sleep hygiene is the collective term for habits that support sleep. The most impactful adjustments include maintaining a consistent sleep schedule, even on weekends, keeping the bedroom dark and cool, and avoiding screens for at least an hour before bed. A complete overview of these habits can be found in.
Additionally, it helps to use the bedroom exclusively for sleeping. Working, watching series, or worrying in bed reinforces the association between bed and wakefulness. A clear boundary between day and night helps the body to produce melatonin at the right time.
Sleep aids such as a sleep mask, earplugs, or a white noise machine can optimize the sleep environment and eliminate external stimuli. They do not solve insomnia but can improve the conditions for sleep and thus contribute to a more peaceful night.