Sleep disorders — particularly insomnia — refer to persistent difficulties falling asleep, staying asleep, or waking up too early with reduced restorative quality of sleep.
Insomnia is considered clinically significant when symptoms persist for several weeks and are associated with noticeable impairment in daily functioning — for example, due to fatigue, concentration difficulties, or mood fluctuations.
Sleep is a central factor in physical and psychological recovery. Chronic sleep disturbances increase the risk of depression, anxiety disorders, and physical illnesses.
Symptoms
Nighttime symptoms:
Difficulty falling asleep
Frequent awakenings during the night
Early morning awakening without being able to fall back asleep
Restless, non-restorative sleep
Daytime symptoms:
Fatigue and exhaustion
Concentration difficulties
Irritability
Reduced performance
Increased stress sensitivity
A cycle often develops involving worry about sleep (“sleep pressure”) and increasing inner tension.
Types
Acute insomnia (short-term, e.g., stress-related)
Chronic insomnia (lasting longer than 3 months)
Psychophysiological insomnia (learned sleep disturbance associated with rumination in bed)
Sleep disturbances related to other conditions (e.g., depression, anxiety, pain)
A differentiated diagnosis is important in order to treat underlying causes effectively.
Causes
Sleep disorders usually arise from an interaction of multiple factors:
Psychological stress and strain
Rumination and inner tension
Irregular sleep rhythm
Excessive media use in the evening
Physical illnesses
Substance use (e.g., alcohol, caffeine)
Anxiety about not being able to sleep often develops, further reinforcing the problem.