Last updated: September 2026
General information only
The content on Lumendal is provided for general informational and educational purposes only. It is not medical advice, psychological advice, diagnosis or treatment, and it must not be relied on as such.
We are not clinicians
Lumendal is produced by an independent editorial team. We are not doctors, psychologists, psychiatrists or therapists. We do not know your medical history, your medication, or your circumstances, and nothing published here is tailored to any individual.
No professional relationship
Reading this site, contacting us, or buying one of our products does not create a doctor–patient, therapist–client or any other professional relationship.
Always seek professional advice
Always seek the advice of a qualified health professional with any questions about a medical or mental health condition. Never disregard professional advice, or delay seeking it, because of something you have read here.
Never start, stop or change prescribed medication — including sleep medication — on the basis of anything on this site. Some medications require a carefully managed reduction, and stopping abruptly can be dangerous.
In an emergency
If you are in crisis, or you think you may have a medical emergency, contact your local emergency services immediately. Do not rely on this website. Crisis lines for several countries are listed on our when to seek help page.
About the techniques we describe
Techniques described on this site are drawn from published self-help and cognitive behavioural literature. They are described for general information. They may not be suitable for you, they may not work for you, and some — sleep restriction in particular — carry specific cautions that we set out on the relevant pages. If in doubt, discuss them with a clinician before trying them.
About products and third parties
Products reviewed on this site are not endorsed as treatments. Our own products are self-help materials and make no medical claims. We are not responsible for the content, claims, availability or practices of any third-party website or product we link to.
Accuracy and currency
We make genuine efforts to keep content accurate and current, and we cite our sources. Health information changes, however, and we give no warranty that everything here is complete, current or error-free. To the fullest extent permitted by law, we accept no liability for any loss arising from reliance on this website.
Affiliate disclosure
Some links on this site are affiliate links, and we may earn a commission at no extra cost to you. This never influences which tools we include or what we say about them. See our editorial policy, and who we are for the people behind it.