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.
Sleep: 16-18 hours a day are spent sleeping. Half is in REM sleep and the other is Deep sleep. REM sleep is when we dream. It is when the best sleep occurs and it is truly necessary to function. Auto-Stimulation Hypothesis - REM sleep is necessary Other states consist of Drowsiness, Quiet Alertness, and Crying.