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.
Morning lark: It is not unusual for people to wake up when sunlight enters their eyes. Getting up early does not necessarily mean that you are losing deep sleep. The latter part of your night is spent largely in rem sleep. True deep sleep would be considered stage n3 sleep. This is a combination of what used to be called stage iii and four sleep. I don't believe that there is any significant correlation between getting up early and losing deep sleep which can occur even earlier in the night.