body performs self-maintenance Sleep allows all sorts of good things to happen body performs self-maintenance Independent.co.uk body performs self-maintenance rats have died Independent.co.uk Independent.co.uk body performs self-maintenance body performs self-maintenance body performs self-maintenance Independent.co.uk Independent.co.uk body performs self-maintenance REM and NREM sleep Independent.co.uk Independent.co.uk The Independent body performs self-maintenance https://www.independent.co.uk/life-style/health-a... Independent.co.uk source