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Why sleep is not an "add-on"
Sleep is not a luxury or a "nice addition" to the day but one of the fundamental regulators of the nervous system, emotions, memory and psychological resilience.
People with chronic insomnia have a many-fold higher risk of developing depression and anxiety disorders, and sleep problems can make it difficult to stabilize symptoms despite ongoing treatment.
Sleep and mental health – what do studies show?
Sleep disorders (insomnia, shortened sleep, disrupted circadian rhythm) are among the most common symptoms accompanying depression, anxiety disorders, bipolar disorder and PTSD.
Large studies and meta-analyses show that people with chronic insomnia have about a 2–3 times higher risk of developing depression, and insomnia that does not resolve in remission increases the risk of relapse.
Poor sleep quality is also associated with greater anxiety severity, poorer emotion regulation, decreased concentration and lower subjective wellbeing.
In a meta-analysis of over 50 studies including more than 10,000 adults, improvement in sleep quality was associated with a significant reduction in symptoms of depression and anxiety – the effect was of moderate size, which is clinically noticeable.
Insomnia and the psyche – a feedback loop
The relationship between "insomnia and the psyche" is bidirectional: psychological problems worsen sleep, and sleep problems increase symptoms.
With low mood, ruminations and worry in the evening are common – they make it harder to fall asleep, prolong time awake in bed and reduce the sense of restoration after a night.
Conversely, chronic sleep shortening and frequent awakenings lower the threshold for stress tolerance, increase irritability, feelings of overload and difficulties in emotion regulation.
Insomnia stops being only a "secondary symptom" – it becomes one of the factors that perpetuate mood and anxiety disorders. Therefore, modern approaches recommend treating sleep as a separate clinical target, not merely an indicator of improvement.
Sleep quality and depression – why the night matters for the day
In depression, sleep disturbances can take various forms: difficulty falling asleep, frequent awakenings, very early morning awakening or excessive sleepiness.
Studies suggest that changes in sleep architecture (among others. shortening of slow‑wave sleep phases, changes in REM phase) are associated with poorer emotion and memory regulation, which can perpetuate depressive symptoms.
In reviews of interventions aimed at improving sleep (e.g. cognitive‑behavioral therapy for insomnia – CBT‑I, sleep hygiene) not only better sleep quality but also reductions in depression and anxiety symptoms were observed – sometimes even when the intervention’s formal goal was not to treat depression.
How to improve sleep – elements of sleep hygiene and nervous system regulation
Evidence‑based approaches list several basic pillars for improving sleep:
Consistent bed and wake times
Going to bed and getting up at similar times, including on days off, helps stabilize the circadian rhythm.
Reduce screen exposure and strong stimuli before sleep
Blue light, intense content (emails, messages, social media) and intellectual work before sleep increase nervous system arousal.
Wind‑down ritual
Repeating activities (e.g. a warm shower, light stretching, breathing exercises, mindfulness practice) reduce arousal and prepare the body for sleep.
Bed only for sleep and sex
Limiting work, watching films or scrolling in bed helps the brain associate the bed with rest rather than wakefulness.
Caffeine, alcohol, heavy meals – use consciously and with distance
Caffeine in the late afternoon, alcohol as "sleep aid" and large meals right before bed worsen sleep quality, increase awakenings and fragment sleep.
In clinical practice, interventions such as CBT‑I (structured insomnia therapy), sometimes pharmacotherapy, and work on beliefs and fear of sleeplessness are added to these measures.
Sleep from the perspective of holistic psychiatry
In the holistic approach sleep is treated as one of the most important elements of nervous system regulation – alongside movement, nutrition, breathwork, relationships and boundaries at work.
In the Holistica model – holistic psychiatry online – not only symptoms are discussed but also how the patient’s night looks: time of falling asleep, awakenings, pre‑sleep rituals, sense of restoration, impact of occupational load and chronic stress.
During psychiatric consultations online, in‑person or as e‑visits it is possible to plan individual steps: from simple changes in sleep hygiene, through nervous system regulation techniques, to decisions about pharmacotherapy – always taking into account the full clinical picture and patient safety.
The information in this article is general and educational in nature.
It does not constitute medical advice or individual diagnostic or therapeutic recommendations.
Decisions about starting, continuing or changing treatment, including modifying doses of antidepressant medications, should be made only after consultation with a physician, taking into account the patient’s full clinical picture.
Selected sources
Stanford Medicine. How sleep affects mental health (and vice versa). 2025.
Meta-analysis of sleep quality interventions on depression and anxiety. 54 RCTs, 1998–2024.
Harvey A, et al. Sleep and psychiatric disorders: bidirectional interactions. 2025.
Hopkins Medicine. Depression and Sleep: Understanding the Connection. 2024.
Sleep hygiene and CBT‑I in improving anxiety and depression. Palliative Medicine in Practice. 2025.
