Congratulations to Imran Usmani for passing his PhD confirmation examination. It was held on Wednesday 22 January, and the examiners were Vikki Revell (Surrey Sleep Research Centre) and Gianne Derks. The title of Imran’s project is “A mathematical modelling approach to the prediction of circadian phase“. The project supervisors are Anne Skeldon and Derk-Jan Dijk (Surrey Sleep Research Centre).