Madrid-Valero, J.J.; Barclay, Nicola L. and Gregory, Alice M.. 2024. The interaction between polygenic risk and environmental influences: a direct test of the 3P model of insomnia in adolescents. Journal of Child Psychology and Psychiatry, 65(3), pp. 308-315. ISSN 0021-9630 [Article]

Madrid-Valero, Juan J.; Matthews, Timothy; Barclay, Nicola L.; Odgers, Candice L.; Moffitt, Terrie E.; Caspi, Avshalom; Arseneault, Louise and Gregory, Alice M.. 2023. Problematic technology use and sleep quality in young adulthood: Novel insights from a nationally representative twin study. Sleep, 46(6), ISSN 0161-8105 [Article]

Madrid-Valero, Juan J; Barclay, Nicola L.; Rowe, Richard; Perach, Rotem; Buysse, Daniel J.; Ordoñana, Juan R.; Eley, Thalia C. and Gregory, Alice M.. 2021. Association between symptoms of sleep apnea and problem behaviors in young adult twins and siblings. Psychological Medicine, 51(7), 1175 -1182. ISSN 0033-2917 [Article]

Denis, Dan; Akhtar, Reece; Holding, Ben; Murray, C; Panatti, J; Claridge, Gordon; Sadeh, Avi; Barclay, Nicola L.; O'Leary, R; Maughan, Barbara; McAdams, Tom A.; Rowe, Richard; Eley, Thalia C.; Viding, Essi and Gregory, Alice M.. 2017. Externalizing Behaviors and Callous-Unemotional Traits: Different Associations With Sleep Quality. Sleep, 40(8), ISSN 0161-8105 [Article]

Gregory, Alice M.; Rijsdijk, Fruhling V.; Eley, Thalia C.; Buysse, Daniel J.; Schneider, Melanie N.; Parsons, Michael J. and Barclay, Nicola L.. 2016. A longitudinal twin and sibling study of associations between insomnia and depression symptoms in young adults. Sleep, 39(11), pp. 1985-1992. ISSN 0161-8105 [Article]

Barclay, Nicola L.; Rowe, Richard; O'Leary, R; Bream, D.E. and Gregory, Alice M.. 2016. Longitudinal stability of genetic and environmental influences on the association between diurnal preference and sleep quality in young adult twins and siblings. Journal of Biological Rhythms, 31(4), pp. 375-386. ISSN 0748-7304 [Article]

Barclay, Nicola L.; Gehrman, P.R.; Gregory, Alice M.; Eaves, L.J and Silberg, J.L.. 2015. The heritability of insomnia from childhood to adolescence: results from a longitudinal twin study. Sleep, 38(1), pp. 109-118. ISSN 0161-8105 [Article]

Parsons, Michael J.; Lester, Kathryn J.; Barclay, Nicola L.; Archer, Simon N.; Nolan, Patrick M.; Eley, Thalia C. and Gregory, Alice M.. 2014. Polymorphisms in the circadian expressed genes PER3 and ARNTL2 are associated with diurnal preference and GNB3 with sleep measures. Journal of Sleep Research, 23(5), pp. 595-604. ISSN 0962-1105 [Article]

Barclay, Nicola L. and Gregory, Alice M.. 2014. Sleep in Childhood and Adolescence: Age-Specific Sleep Characteristics, Common Sleep Disturbances and Associated Difficulties. Current topics in behavioral neurosciences, 16, pp. 337-365. ISSN 1866-3370 [Article]

Parsons, Michael J.; Lester, Kathryn J.; Barclay, Nicola L.; Nolan, Patrick M.; Eley, Thalia C. and Gregory, Alice M.. 2013. Replication of Genome-Wide association studies (GWAS) loci for sleep in the British G1219 cohort. American Journal of Medical Genetics Part B: Neuropsychiatric Genetics, 162(5), pp. 431-438. ISSN 15524841 [Article]

McAdams, Tom A.; Gregory, Alice M.; Rowe, Richard; Zavos, Helena M. S.; Barclay, Nicola L.; Lau, Jennifer Y. F.; Maughan, Barbara and Eley, Thalia C.. 2013. The Genesis 12-19 (G1219) Study: A Twin and Sibling Study of Gene-Environment Interplay and Adolescent Development in the UK. Twin Research and Human Genetics, 16(01), pp. 134-143. ISSN 1832-4274 [Article]

Barclay, Nicola L. and Gregory, Alice M.. 2013. Quantitative genetic research on sleep: A review of normal sleep, sleep disturbances and associated emotional, behavioural, and health-related difficulties. Sleep Medicine Reviews, 17(1), pp. 29-40. ISSN 10870792 [Article]

Barclay, Nicola L.; Eley, Thalia C.; Parsons, Michael J.; Willis, Thomas A. and Gregory, Alice M.. 2013. Monozygotic twin differences in nonshared environmental factors associated with chronotype. Journal of Biological Rhythms, 28, pp. 51-61. [Article]

Zavos, Helena M. S.; Wong, Chloe; Barclay, Nicola L.; Keers, Robert; Mill, Jonathan; Rijsdijk, Fruhling V.; Gregory, Alice M. and Eley, Thalia C.. 2012. Anxiety sensitivity in adolescence and young adulthood: the role of stressful life events, 5HTTLPR and their interaction. Depression and Anxiety, pp. 400-408. ISSN 1091-4269 [Article]

Barclay, Nicola L.; Eley, Thalia C.; Buysse, Daniel J.; Maughan, Barbara and Gregory, Alice M.. 2012. Nonshared environmental influences on sleep quality: A study of monozygotic twin differences. Behavior Genetics, 42, pp. 234-244. [Article]

Barclay, Nicola L.; Eley, Thalia C.; Maughan, Barbara; Rowe, Richard and Gregory, Alice M.. 2011. Associations between diurnal preference, sleep quality and externalising behaviours: A behavioural genetic analysis. Psychological Medicine, 41, pp. 1029-1040. [Article]

Gregory, Alice M.; Buysse, Daniel J.; Willis, Thomas A.; Rijsdijk, Fruhling V.; Maughan, Barbara; Rowe, Richard; Cartwright, Sally; Barclay, Nicola L. and Eley, Thalia C.. 2011. Associations between sleep quality and anxiety and depression symptoms in a sample of young adult twins and siblings. Journal of Psychosomatic Research, 71, pp. 250-255. [Article]

Barclay, Nicola L.; Eley, Thalia C.; Rijsdijk, Fruhling V. and Gregory, Alice M.. 2011. Dependent negative life events and sleep quality: An examination of gene-environment interplay. Sleep Medicine, 12, pp. 403-409. [Article]

Barclay, Nicola L.; Eley, Thalia C.; Mill, Jonathan; Wong, Chloe C. Y.; Zavos, Helena M. S.; Archer, Simon N. and Gregory, Alice M.. 2011. Sleep quality and diurnal preference in a sample of young adults: Associations with 5HTTLPR, PER3 and CLOCK 3111. American Journal of Medical Genetics Part B: Neuropsychiatric Genetics, 156(6), pp. 681-690. ISSN 1552-4841 [Article]

Barclay, Nicola L.; Eley, Thalia C.; Buysse, Daniel J.; Archer, Simon N. and Gregory, Alice M.. 2010. Diurnal preference and sleep quality: same genes? A study of Young Adult twins. Chronobiology International, 27, pp. 278-296. [Article]

Barclay, Nicola L.; Eley, Thalia C.; Buysse, Daniel J.; Rijsdijk, Fruhling V. and Gregory, Alice M.. 2010. Genetic and environmental influences on different components of the Pittsburgh Sleep Quality Index and their overlap. Sleep, 33, pp. 659-668. [Article]

Barclay, Nicola L. and Gregory, Alice M.. 2010. The presence of a perseverative iterative style in poor vs. good sleepers. Journal of Behavior Therapy and Experimental Psychiatry, 41(1), pp. 18-23. ISSN 00057916 [Article]

Gregory, Alice M. and Barclay, Nicola L.. 2009. Too stressed to sleep. The Psychologist, 22(8), pp. 676-677. [Article]

Barclay, Nicola L.; Hysing, M; Sivertsen, B and Gregory, Alice M.. 2021. Chapter 4. Developmental Trajectories of Insomnia. In: C Drake and J Fernandez-Mendoza, eds. Principles and Practices of Sleep Medicine - Section 11: Insomnia. Amsterdam: Elsevier. [Book Section] (In Press)

Gregory, Alice M.; Parsons, Michael J.; Barclay, Nicola L.; Gehrman, P.R. and O'Leary, R.E.. 2016. Genetic Research on Sleep, Sleep Disturbances and Associated Difficulties. In: S.B. Malykh; Y.V. Kovas and D.A. Gaysina, eds. Behavioural Genomics: Child Development and Education. Tomsk: Publishing House of Tomsk State University, pp. 276-299. [Book Section]

Barclay, Nicola L.. 2011. Genetic and Environmental Influences on Sleep Quality: Quantitative and Molecular Genetic Approaches to an Understanding of Individual Differences. Doctoral thesis, Goldsmiths, University of London [Thesis]