Details of the varibales inlcuded in the associated .csv file. Sex: 2 = Female Student 1 = Yes Year of study - self explanatory rMEQ = Morningness Eveningness Questionnaire - a Reduced scale. rMEQ_Groups = Uses standardised cut offs for the rMEQ to indentify Morning types (coded as 1), Neither types (2) and Evening types (3). Sleep work and sleep free days is average (in hours) reported by participants Social jetlag = Sleep free - Sleep work Sleep quality is a Likert type response scale: 1 = Very poor 2 = Poor 3 = Average 4 = Good 5 = Excellent Loneliness indexed by the 3 item UCL loneliness scale (sum of the three tiems) Loneliness groups - participants considered lonely if there sum score was 6 or more (coded as a 1, else 0)