Caloric consumption in a society with readily available food is likely to be approximately proportional to the number of hours of being awake. Thus, replacing 1 h of inactive wakefulness (e.g. watching TV), with sleeping is likely to result in a substantial reduction in caloric intake. Calculations are presented to illustrate the possible benefits of such a switch on weight reduction.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/75728/1/j.1467-789X.2006.00262.x.pd