When I stayed in a zen monastery a while back, I averaged 6 hours of sleep a night, and always felt refreshed, but out in the regular world, even with daily med

When I stayed in a zen monastery a while back, I averaged 6 hours of sleep a night, and always felt refreshed, but out in the regular world, even with daily meditation, I need about 8 hours of sleep. So I think that the environment and meditation techniques must play a part.