Letterkenny Institute of Technology, Port Road, Letterkenny, F92 FC93 County Donegal, Ireland. ronan.doherty@lyit.ie. Sport Ireland Institute, National Sport Campus, Abbotstown, 15, D15 Y52H, Dublin, Ireland. ronan.doherty@lyit.ie. Northumbria Centre for Sleep Research, Northumbria University, Newcastle, NE1 8ST, UK. ronan.doherty@lyit.ie. Sport Ireland Institute, National Sport Campus, Abbotstown, 15, D15 Y52H, Dublin, Ireland. smadigan@instituteofsport.ie. Health Research Institute, Schuman Building, University of Limerick, V94 T9PX County Donegal, Ireland. giles.warrington@ul.ie. Department of Physical Education and Sport Sciences, University of Limerick, V94 T9PX County Donegal, Ireland. giles.warrington@ul.ie. Northumbria Centre for Sleep Research, Northumbria University, Newcastle, NE1 8ST, UK. jason.ellis@northumbria.ac.uk.