- medical advances add 40 years to our lives (maybe) so we can live to 120 - use polyphasic sleeping to sleep 4 hrs a day - for the next 80 years (for a 40 year

- medical advances add 40 years to our lives (maybe) so we can live to 120 - use polyphasic sleeping to sleep 4 hrs a day - for the next 80 years (for a 40 year old man) - and gain another 20 years in awake time so in effect you may be able to live 140 years! Cool.