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.
1 As we get older, the number of hours of sleep we need each night lessen. 2  The extreme ranges include newborns that sleep anywhere from 11 to 19 hours each 24 hours period, with 14 to 17 hours considered the average range, to adults over age 65 that sleep from 5 to 9 hours each night, with the average being 7 to 8 hours.