Forest plot for total sleep duration (nā=ā10). Notes: Sub-group analysis based on whether participants were habitual short sleepers (1-yes, 0-no); overall weighted mean difference (WMD) = 51 min, z = 8.33, P < 0.001; WMD for Group 1 = 50 min, z = 6.68, P < 0.001; WMD for Group 0 = 54 min, z = 6.32, P < 0.001.