2026

• Vethe, Daniel; Khan, Zareen; Vestergaard, Cecilie Lund; Halsteinli, Vidar; Saksvik, Simen Berg; Vedaa, Øystein; Sivertsen, Børge; Morken, Gunnar; Langsrud, Knut; Ritterband, Lee M.. (2026) Long-term clinical and cost-effectiveness of a fully automated digital cognitive behavioural therapy for insomnia: 2-year follow-up of a single-blind, superiority, randomised controlled trial. The Lancet Regional Health - Europe
  Academic article

2025

• Türkmen, Cagdas; Schneider, Carlotta L.; Furukawa, Yuki; Dalfsen, Jens H. Van; Mccall, William V.; Pigeon, Wilfred R.; Tubbs, Andrew S.; Perlis, Michael L.; Riemann, Dieter; Spiegelhalder, Kai. (2025) Cognitive behavioral therapy for insomnia as a suicide prevention strategy: a protocol for a systematic review and meta-analysis. SLEEP Advances
  Academic article
• Saksvik, Simen Berg; Rønhovde, Liv Marie; Lynum, Kristine; Langsrud, Knut; Olsen, Alexander; Nair, Roshan das; Lydersen, Stian; Holthe, Julie; Halvorsen, Joar Øveraas; Morken, Gunnar. (2025) Digital cognitive behavioral therapy for insomnia compared with digital patient education about insomnia in people with multiple sclerosis in Norway: study protocol for a randomized controlled trial. SLEEP Advances
  Academic article

2024

• Kallestad, Håvard; Langsrud, Knut; Simpson, Melanie Rae; Vestergaard, Cecilie Lund; Vethe, Daniel; Kjørstad, Kaia; Faaland, Patrick Michael Palmelund; Lydersen, Stian; Morken, Gunnar; Ulsaker-Janke, Ingvild. (2024) Clinical benefits of modifying the evening light environment in an acute psychiatric unit: A single-centre, two-arm, parallel-group, pragmatic effectiveness randomised controlled trial. PLoS Medicine
  Academic article
• Filosa, James; Omland, Petter Moe; Hagen, Knut; Langsrud, Knut; Engstrøm, Morten; Sand, Trond Halfdan. (2024) Validation of Trøndelag Apnoea Score Proxy for Obstructive Sleep Apnoea in the General Population of Norway: The HUNT Study. Sleep Disorders
  Academic article
• Vestergaard, Cecilie Lund; Simpson, Melanie Rae; Sivertsen, Børge; Kallestad, Håvard; Langsrud, Knut; Scott, Janine Linda; Vedaa, Øystein. (2024) Weekday-to-weekend sleep duration patterns among young adults and outcomes related to health and academic performance. Sleep Science and Practice (SSP)
  Academic article
• Drews, Henning Johannes; Felletti, Flavia; Kallestad, Håvard; Drews, Annika; Scott, Janine Linda; Sand, Trond Halfdan; Engstrøm, Morten; Heglum, Hanne Siri Amdahl; Vethe, Daniel; Salvesen, Øyvind Olav. (2024) Using cross-recurrence quantification analysis to compute similarity measures for time series of unequal length with applications to sleep stage analysis. Scientific Reports
  Academic article
• Ramfjord, Lina Stålesen; Kahn, Nikolaj; Langsrud, Knut; Halvorsen, Joar Øveraas; Morken, Gunnar; Saksvik, Simen Berg; Sættem, Liv Sigrun; Lydersen, Stian; Kallestad, Håvard. (2024) Chronotherapy for patients with a depressive episode treated in a public outpatient mental healthcare clinic in Norway: protocol for a randomised controlled trial. BMJ Open
  Academic article
• Engum, Anne; Morken, Gunnar; Vaaler, Arne; Langsrud, Knut; Ødegaard, Ketil Joachim; Syrstad, Vigdis Elin Giæver; Aminoff, Sofie Ragnhild; Engen, Magnus Johan; Lyngstad, Siv Hege; Lagerberg, Trine Vik. (2024) BIPOLARVEILEDER – OPPDATERT KUNNSKAP. Norges teknisk-naturvitenskapelige universitet
  Research report

2023

• Bjorvatn, Bjørn; Kallestad, Håvard; Langsrud, Knut; Vedaa, Øystein; Pallesen, Ståle; Waage, Siri; Wilhelmsen-Langeland, Ane; Saxvig, Ingvild; Abeler, Karin Louise. (2023) Nasjonal anbefaling for utredning og behandling av døgnrytmelidelser. SØVN
  Professional article
• Ramfjord, Lina Stålesen; Faaland, Patrick Michael Palmelund; Scott, Janine Linda; Saksvik, Simen Berg; Lydersen, Stian; Vedaa, Øystein; Kahn, Nikolaj; Langsrud, Knut; Stiles, Tore Charles; Ritterband, Lee M.. (2023) Digital cognitive behaviour therapy for insomnia in individuals with self-reported insomnia and chronic fatigue: A secondary analysis of a large scale randomized controlled trial. Journal of Sleep Research
  Academic article
• Faaland, Patrick; Vedaa, Øystein; Langsrud, Knut; Sivertsen, Børge; Lydersen, Stian; Saksvik, Simen Berg; Vestergaard, Cecilie Lund; Kjørstad, Kaia; Vethe, Daniel; Ritterband, Lee M.. (2023) Dysfunctional beliefs and attitudes about sleep (DBAS) mediate outcomes in dCBT-I on psychological distress, fatigue, and insomnia severity. Sleep Medicine
  Academic article

2022

• Heglum, Hanne Siri Amdahl; Drews, Henning Johannes; Kallestad, Håvard; Vethe, Daniel; Langsrud, Knut; Sand, Trond; Engstrøm, Morten. (2022) Contact-free radar recordings of body movement can reflect ultradian dynamics of sleep. Journal of Sleep Research
  Academic article
• Scott, Janine Linda; Vedaa, Øystein; Sivertsen, Børge; Langsrud, Knut; Kallestad, Håvard. (2022) Using network intervention analysis to explore associations between participant expectations of and difficulties with cognitive behavioural therapy for insomnia and clinical outcome: A proof of principle study. Journal of Psychiatric Research
  Academic article
• Vethe, Daniel; Drews, Henning Johannes; Scott, Janine Linda; Engstrøm, Morten; Heglum, Hanne Siri Amdahl; Grønli, Janne; Wisor, J.P.; Sand, Trond; Lydersen, Stian; Kjørstad, Kaia. (2022) Evening light environments can be designed to consolidate and increase the duration of REM-sleep. Scientific Reports
  Academic article
• Kjørstad, Kaia; Faaland, Patrick; Sivertsen, Børge; Kallestad, Håvard; Langsrud, Knut; Vethe, Daniel; Vestergaard, Cecilie Lund; Harris, Anette Kristoffersen; Pallesen, Ståle; Scott, Janine Linda. (2022) Sleep and work functioning in nurses undertaking inpatient shifts in a blue-depleted light environment. BMC Nursing
  Academic article
• Faaland, Patrick; Vedaa, Øystein; Langsrud, Knut; Sivertsen, Børge; Lydersen, Stian; Vestergaard, Cecilie Lund; Kjørstad, Kaia; Vethe, Daniel; Ritterband, Lee M.; Harvey, Allison G.. (2022) Digital cognitive behaviour therapy for insomnia (dCBT-I): Chronotype moderation on intervention outcomes. Journal of Sleep Research
  Academic article
• Filosa, James; Omland, Petter Moe; Hagen, Knut; Langsrud, Knut; Brenner, Eiliv; Knutsen, Andreas; Drange, Ole Kristian; Gravdahl, Gøril Bruvik; Stjern, Marit; Engstrøm, Morten. (2022) Validation of questionnaires for restless legs syndrome in the general population: the Trøndelag Health Study (HUNT). Journal of Sleep Research
  Academic article
• Kjørstad, Kaia; Sivertsen, Børge; Vedaa, Øystein; Langsrud, Knut; Vethe, Daniel; Faaland, Patrick; Vestergaard, Cecilie; Lydersen, Stian; Smith, Otto Robert Frans; Scott, Janine Linda. (2022) The effects of digital CBT-I on work productivity and activity levels and the mediational role of insomnia symptoms: Data from a randomized controlled trial with 6-month follow-up. Behaviour Research and Therapy
  Academic article

2021

• Kallestad, Håvard; Scott, Janine Linda; Vedaa, Øystein; Lydersen, Stian; Vethe, Daniel; Morken, Gunnar; Stiles, Tore C; Sivertsen, Børge; Langsrud, Knut. (2021) Mode of delivery of Cognitive Behavioral Therapy for Insomnia: a randomized controlled non-inferiority trial of digital and face-to-face therapy. Sleep
  Academic article
• Kallestad, Håvard; Saksvik, Simen Berg; Vedaa, Øystein; Langsrud, Knut; Morken, Gunnar; Lydersen, Stian; Simpson, Melanie Rae; Dørheim, Signe Karen; Holmøy, Bjørn; Selvik, Sara Germans. (2021) Digital cognitive-behavioural therapy for insomnia compared with digital patient education about insomnia in individuals referred to secondary mental health services in Norway: Protocol for a multicentre randomised controlled trial. BMJ Open
  Academic article
• Bredeli, Einar Rørstad; Vestergaard, Cecilie Lund; Sivertsen, Børge; Kallestad, Håvard; Øverland, Simon Nygaard; Ritterbandt, Lee M.; Glozier, Nick; Pallesen, Ståle; Scott, Jan; Langsrud, Knut. (2021) Intraindividual variability in sleep among people with insomnia and its relationship with sleep, health and lifestyle factors: an exploratory study. Sleep Medicine
  Academic article
• Scott, Janine Linda; Langsrud, Knut; Goulding, Ingunn Rø; Kallestad, Håvard. (2021) Let there be blue-depleted light: In-patient dark therapy, circadian rhythms and length of stay. BJ Psych Advances
  Academic article
• Vestergaard, Cecilie Lund; Vedaa, Øystein; Simpson, Melanie Rae; Faaland, Patrick; Vethe, Daniel; Kjørstad, Kaia; Langsrud, Knut; Ritterband, Lee M; Sivertsen, Børge; Stiles, Tore C. (2021) The effect of sleep-wake intraindividual variability in digital cognitive behavioral therapy for insomnia: a mediation analysis of a large-scale RCT. Sleep
  Academic article
• Heglum, Hanne Siri Amdahl; Kallestad, Håvard; Vethe, Daniel; Langsrud, Knut; Sand, Trond; Engstrøm, Morten. (2021) Distinguishing sleep from wake with a radar sensor: A contact-free real-time sleep monitor. Sleep
  Academic article

2020

• Filosa, James; Omland, Petter Moe; Langsrud, Knut; Hagen, Knut; Engstrøm, Morten; Drange, Ole Kristian; Knutsen, Andreas; Brenner, Eiliv; Kallestad, Håvard; Sand, Trond. (2020) Validation of insomnia questionnaires in the general population: The Nord-Trøndelag Health Study (HUNT). Journal of Sleep Research
  Academic article
• Vedaa, Øystein; Kallestad, Håvard; Scott, Janine Linda; Smith, Otto Robert Frans; Pallesen, Ståle; Morken, Gunnar; Langsrud, Knut; Gehrman, Philip; Thorndike, Frances P.; Ritterband, Lee M.. (2020) Effects of digital cognitive behavioural therapy for insomnia on insomnia severity: a large-scale randomised controlled trial. The Lancet Digital Health
  Academic article
• Drews, Henning Johannes; Scott, Janine Linda; Langsrud, Knut; Vethe, Daniel; Kallestad, Håvard. (2020) Chronobiologically informed inpatient milieu in psychiatric institutions. The Lancet Psychiatry
  Commentary
• Vethe, Daniel; Scott, Janine Linda; Engstrøm, Morten; Salvesen, Øyvind; Sand, Trond; Olsen, Alexander; Morken, Gunnar; Heglum, Hanne Siri Amdahl; Kjørstad, Kaia; Faaland, Patrick. (2020) The evening light environment in hospitals can be designed to produce less disruptive effects on the circadian system and improve sleep. Sleep
  Academic article
• Kjørstad, Kaia; Sivertsen, Børge; Vedaa, Øystein; Langsrud, Knut; Faaland, Patrick; Vethe, Daniel; Vestergaard, Cecilie Lund; Scott, Janine Linda; Kallestad, Håvard. (2020) The Effect of Reducing Insomnia Severity on Work- and Activity-Related Impairment. Behavioral Sleep Medicine
  Academic article

2019

• Scott, Janine Linda; Langsrud, Knut; Vethe, Daniel; Kjørstad, Kaia; Vestergaard, Cecilie Lund; Faaland, Patrick; Lydersen, Stian; Vaaler, Arne; Morken, Gunnar; Torgersen, Terje. (2019) A pragmatic effectiveness randomized controlled trial of the duration of psychiatric hospitalization in a trans- diagnostic sample of patients with acute mental illness admitted to a ward with either blue-depleted evening lighting or normal lighting conditions. Trials
  Academic article
• Kallestad, Håvard; Kjørstad, Kaia; Vethe, Daniel; Vestergaard, Cecilie Lund; Faaland, Patrick; Langsrud, Knut. (2019) Det nye sykehusbygget på Østmarka integrerer behandling, innovasjon og søvnforskning. SØVN
  Popular science article
• Langsrud, Knut; Vaaler, Arne; Morken, Gunnar; Kallestad, Håvard; Almvik, Roger; Palmstierna, Tom Krisman Kule; Guzey, Ismail Cuneyt. (2019) The predictive properties of violence risk instruments may increase by adding items assessing sleep. Frontiers in Psychiatry
  Academic article

2018

• Kallestad, Håvard; Langsrud, Knut; Vedaa, Øystein; Stiles, Tore C; Vethe, Daniel; Lydersen, Stian; Ritterband, Lee; Morken, Gunnar; Sivertsen, Børge. (2018) A randomized noninferiority trial comparing Cognitive Behavior Therapy for Insomnia (CBT-I) delivered by a therapist or via a fully automated online treatment program. Sleep
  Conference abstract
• Langsrud, Knut; Kallestad, Håvard; Vaaler, Arne; Almvik, Roger; Palmstierna, Tom Krisman Kule; Morken, Gunnar. (2018) Sleep at night and association to aggressive behaviour; Patients in a psychiatric intensive care unit. Psychiatry Research
  Academic article
• Solheim, Brandy; Olsen, Alexander; Kallestad, Håvard; Langsrud, Knut; Bjorvatn, Bjørn; Gradisar, Michael; Sand, Trond. (2018) Cognitive performance in DSWPD patients upon awakening from habitual sleep compared with forced conventional sleep. Journal of Sleep Research
  Academic article
• Solheim, Brandy; Langsrud, Knut; Kallestad, Håvard; Engstrøm, Morten; Bjorvatn, Bjørn; Sand, Trond. (2018) Sleep structure and awakening threshold in delayed sleep-wake phase disorder patients compared to healthy sleepers. Sleep Medicine
  Academic article

2016

• Krane-Gartiser, Karoline; Steinan, Mette Kvisten; Langsrud, Knut; Vestvik, Vegard; Sand, Trond; Fasmer, Ole Bernt; Kallestad, Håvard; Morken, Gunnar. (2016) Mood and motor activity in euthymic bipolar disorder with sleep disturbance. Journal of Affective Disorders
  Academic article
• Langsrud, Knut; Vaaler, Arne Einar; Kallestad, Håvard; Morken, Gunnar. (2016) Sleep patterns as a predictor for length of stay in a psychiatric intensive care unit. Psychiatry Research
  Academic article

2014

• Solheim, Brandy; Langsrud, Knut; Kallestad, Håvard; Olsen, Alexander; Bjorvatn, Bjørn; Sand, Trond. (2014) Difficult morning awakening from rapid eye movement sleep and impaired cognitive function in delayed sleep phase disorder patients. Sleep Medicine
  Academic article
• Steinan, Mette Kvisten; Krane-Gartiser, Karoline; Langsrud, Knut; Sand, Trond; Kallestad, Håvard; Morken, Gunnar. (2014) Cognitive behavioral therapy for insomnia in euthymic bipolar disorder: study protocol for a randomized controlled trial. Trials
  Academic article

2013

• Krane-Gartiser, Karoline; Steinan, Mette Kvisten; Langsrud, Knut; Sand, Trond; Kallestad, Håvard; Morken, Gunnar. (2013) Sleep architecture in euthymic bipolar disorder and comorbid insomnia. Bipolar Disorders
  Conference abstract
• Steinan, Mette Kvisten; Krane-Gartiser, Karoline; Langsrud, Knut; Sand, Trond; Kallestad, Håvard; Morken, Gunnar. (2013) Cognitive behavioral theapy for insomnia in euthymic bipolar disorder: a randomized controlled trial. Bipolar Disorders
  Conference abstract

2012

• Kallestad, Håvard; Hansen, Bjarne; Langsrud, Knut; Ruud, Torleif; Morken, Gunnar; Stiles, Tore C; Gråwe, Rolf W.. (2012) Impact of sleep disturbance on patients in treatment for mental disorders. BMC Psychiatry
  Academic article

2011

• Kallestad, Håvard; Hansen, Bjarne; Langsrud, Knut; Ruud, Torleif; Morken, Gunnar; Stiles, Tore C; Gråwe, Rolf W.. (2011) Differences between patients’ and clinicians’ report of sleep disturbance: a field study in mental health care in Norway. BMC Psychiatry
  Academic article

2010

• Kallestad, Håvard; Hansen, Bjarne; Langsrud, Knut; Hjemdal, Odin; Stiles, Tore C. (2010) Psychometric properties and the predictive validity of the Insomnia Daytime Worry Scale: A pilot study. Cognitive Behaviour Therapy
  Academic article

2007

• Langsrud, Knut; Linaker, Olav Morten; Morken, Gunnar. (2007) Staff injuries after patient-staff incidences in psychiatric acute wards. Nordic Journal of Psychiatry
  Academic article
• Kallestad, Håvard; Langsrud, Knut; Hansen, Bjarne. (2007) Søvndeprivasjon som antidepressiv behandling. Tidsskrift for Den norske legeforening (Tidsskriftet)
  Academic literature review

1999

• Morken, Gunnar; Linaker, Olav Morten; Langsrud, K. (1999) Weekly and daily variations in patient-staff incidents in psychiatric acute wards. Nordic Journal of Psychiatry
  Academic article