Slaves of the Slave System Plantation agriculture was wasteful, largely because King Cotton and his money-hungry subjects despoiled the good earth; quick profits led to excessive cultivation, or âland butchery,â which in turn caused a heavy leakage of population to the West and NW.
It means that since most adults need 8-9 hours of sleep, they will need about 1.6-1.8 hours of deep sleep to feel fully functional next day. However, the time of deep sleep is changed and that's mainly due to the change in the sleep need of different group of people. For instance: Age Group.
A 5 to 6 hours sleep is what I stuck to for years, maybe a powernap of 20 min in noon at times and a good 8 hours sleep once a fortnight.. That's my pattern. The general recommendation is 8 hours, but it depends on lot of things you sleep schedule, work pattern, health targets etc. To simplify all the info I'd say if you are under 35 and active fit one 6 hours is good and above that 7 to 8 hours. More than 60, give your body all the rest it demands.