You can live a stress-free life with just 4 hours of sleep if you use the
Polyphasic Sleep System: 20 minutes of sleep every 4 hours of the day! The problem with this system is that you can't combine it with a regular job or educational programme since you have to sleep every 4 hours. For solopreneurs, it can work really well.
For more information about polyphasic sleep, visit:
www.stevepavlina.com/blog/2005/10/polyphasic-sleep/