A bad night's sleep does not yet constitute a sleep disorder. However, if sleep is absent over a prolonged period, is repeatedly interrupted or ends far too early, this can result in considerable strain. Fatigue, irritability, concentration problems and the worry about the coming night then frequently interlock. A differentiated view is important: sleep problems can have psychological, physical, hormonal, medication-related and behavioural influences. A hasty attribution does not do justice to this complexity.

What is healthy sleep?

Healthy sleep cannot be recognised by a fixed number of hours alone. It encompasses sufficient duration, a sleeping position that suits one's daily routine, a certain degree of regularity, restorative quality and sufficient alertness during the day. The American Academy of Sleep Medicine generally recommends at least seven hours of sleep per night for healthy adults. Individual sleep requirements can nevertheless vary. Age, illness, periods of stress and a previously accumulated sleep deficit also play a role.

Short waking phases at night are normal and are often not remembered. Likewise, individual restless nights are part of human sleep. What is therefore crucial is not whether every night goes perfectly, but whether sleep is restorative overall and daily life can be managed.

What forms of sleep problems are there?

difficulty falling asleep

When having difficulty falling asleep, it regularly takes a long time before sleep occurs. Some people feel physically tired, but experience their head as awake and active. Thoughts jump around, the day is analysed or the coming night is controlled internally. The time on the clock alone does not determine whether there is a disorder. What is relevant are frequency, duration, distress and the consequences during the day.

sleep maintenance insomnia

Falling asleep is initially successful here, but sleep is repeatedly or lengthily interrupted. Short waking up is normal. It becomes distressing when longer waking phases occur frequently, falling back asleep is difficult and clear consequences show during the day.

Early waking

Some people wake up significantly earlier than intended and cannot get back to sleep. Early awakening can occur as part of insomnia, but also with changes in the sleep-wake cycle, physical ailments, hormonal changes or psychological stress. The timing alone does not allow for a diagnosis.

Sleep problems can occur in the short term after stress, illness, travel or changes in daily life. If temporary difficulties turn into persistent complaints, not only triggering factors but also maintaining habits and possible other sleep disorders should be considered.

How do stress, anxiety and rumination affect sleep?

Sleep cannot be forced at will. For falling asleep, the level of activation must drop. Persistent stress, inner tension and anxiety can, however, keep the body on high alert. Attention, muscle tone and mental activity remain elevated. In sleep research, this pattern is frequently described as hyperarousal.

Broodining is often directed at the past, worries rather at what is to come. Both can become particularly present shortly before going to sleep because external distractions disappear. Added to this is the monitoring of one's own sleep: „Am I tired enough yet?“, „How many hours are left?“ or „How am I supposed to function tomorrow?“ Such thoughts are understandable. If they are experienced as threatening, internal activation can increase further.

Anxiety and sleep problems can reinforce each other. Poor sleep can make emotional regulation more difficult, while anxiety and heightened alertness can hinder falling asleep or getting back to sleep. This does not mean that sleep problems are automatically psychologically caused. Rather, it shows why a comprehensive medical history should consider physical, psychological, and everyday factors together.

What physical and hormonal influences are possible?

Sleep problems should not be hastily classified as purely psychological. Pain, respiratory diseases, reflux, cardiovascular diseases, neurological disorders, thyroid dysfunctions and other endocrinological changes can affect sleep. Medications, caffeine, nicotine, alcohol and other substances are also potential triggers or enhancers.

Hormonal changes can also play a role. During pregnancy, perimenopause and menopause, for example, hot flushes, night sweats, physical changes and mood swings can impair sleep. Biological and psychosocial factors often work together here. Deciding which examination or treatment is appropriate is a matter for a doctor or gynaecologist.

Other sleep disorders can act like insomnia or occur alongside it. Loud snoring, observed pauses in breathing or gasping for air at night may indicate a sleep-related breathing disorder. A pronounced urge to move or unpleasant sensations in the legs in the evening may point to restless legs syndrome. Disruptions to the sleep-wake rhythm, for example in shift work, also require their own specialist assessment.

How does the cycle of insomnia develop?

After a few bad nights, many sufferers try to control their sleep more strongly. This reaction is understandable. However, some measures inadvertently increase the pressure and weaken the clear connection between bed and sleep.

Sleep pressure builds up with the duration of wakefulness. Anyone who spends a lot of time in bed after a poor night's sleep or sleeps for a long time during the day may have less sleep pressure in the evening. At the same time, the worry about not sleeping can increase the level of arousal. This creates a cycle of lower sleep pressure, greater monitoring and wake-maintaining habits.

What has been proven to help?

Sleep hygiene as a foundation

Helpful basics include as consistent a wake-up time as possible, sufficient daylight and exercise, a quiet sleeping environment, and a conscious approach to caffeine, nicotine, and alcohol. Larger meals, intense exercise, or upsetting content immediately before sleep can be individually unhelpful. A short evening routine can help to mark the transition from day to night.

Screen light in the evening can also affect sleep. In particular, the blue-enriched light from smartphones and tablets can dampen or delay the evening release of melatonin, meaning that tiredness sets in later. However, this does not mean that no melatonin is produced at all. Stimulating or stressful content, notifications and endless scrolling can also make it harder to fall asleep. Therefore, it can be helpful to put phones and tablets aside in the last 30 to 60 minutes before going to bed and, as far as possible, avoid regularly using the bed for media consumption. When watching television, the direct effect of the light is often lower due to the greater distance, but here too, exciting content and going to bed late can impair sleep. Night mode and lower screen brightness reduce exposure to light, but do not completely replace a screen-free transition period.

These guidelines are not a rigid checklist. Anyone who tries to fulfil every recommendation perfectly can develop additional performance pressure. Current evidence also speaks against using sleep hygiene alone as a treatment for chronic insomnia. It is a sensible foundation, but does not replace individual diagnosis or disorder-specific therapy.

Cognitive behavioural therapy for insomnia

Cognitive behavioural therapy for insomnia, or CBT-I for short, is recommended as the first-line treatment by the German S3 guideline and international specialist guidelines. It combines several components: knowledge about sleep, a sleep diary, strengthening the association between bed and sleep, adjusting the time spent in bed, working on sleep-related cognitions, and strategies for managing tension and relapses.

In so-called stimulus control, the bed is more clearly associated with sleep again. Adjusting the sleep window is intended to bring the time spent in bed closer to the actual sleep time and to consolidate sleep pressure. Such measures are planned individually and reviewed in the course of treatment. Excessive restriction can lead to pronounced fatigue and is not suitable for every situation, such as in certain physical or mental illnesses, pregnancy or an increased risk of accidents. Therefore, it should be professionally supervised.

Cognitive elements focus, among other things, on catastrophic thoughts such as „I won't get through the day without eight hours“ or „If I don't sleep now, everything will go wrong tomorrow“. The aim is not positive thinking, but a more realistic evaluation and a less controlling approach to wakefulness. Randomised trials and clinical guidelines show that multi-component CBT-I can effectively reduce sleep complaints. However, a specific success cannot be guaranteed for the individual case.

When is a medical evaluation important?

Medical investigation is advisable if sleep problems arise for the first time, persist for weeks, significantly impair daily life, or change without an identifiable reason. It is particularly important in cases of loud snoring, observed pauses in breathing, nocturnal shortness of breath, a strong urge to move the legs, unusual nocturnal movements, pronounced daytime sleepiness, or unintended falling asleep.

Pain, a racing heart, changes in weight, hormonal issues, pregnancy, changes in medication or the regular use of sleeping pills should also be discussed with a doctor. Anyone who has to fight falling asleep while driving or at work should, for safety reasons, stop driving or pause dangerous activities and seek medical help promptly.

According to the S3 guideline, diagnostics include taking a medical history, a physical examination as well as sleep diaries and questionnaires. An examination in a sleep laboratory is not necessary for every case of insomnia, but can be important if there is a justified suspicion of other organic sleep disorders.

How can psychotherapeutic support help?

At the beginning of every therapeutic classification is a detailed medical history. In the process, the course and form of the sleep problems, sleep times, daytime stresses, previous attempts, medications and substances, as well as physical and psychological comorbidities are recorded. A sleep diary kept for one to two weeks can make patterns visible without overestimating individual nights.

Psychotherapeutic support can help when stress, worries, inner tension or sleep-related anxiety are contributing to the cycle. Together, helpful habits can be tested, unhelpful appraisals reviewed and strategies for periods of wakefulness developed. In cases of chronic insomnia, treatment is based on the components of CBT-I. At the same time, it remains important to have physical and hormonal influences medically evaluated and, if necessary, treated in parallel.

Which steps are appropriate can only be assessed after the anamnesis. Psychotherapy can provide a structured framework in which changes are carefully planned and reviewed. It does not replace necessary medical diagnostics and cannot guarantee a specific course or treatment success.