The monopod has one leg instead of the standard three legs on the tripod. OTG Digital Photography is not possible without the monopod with a flexible ball head that allows the desired camera orientation needed to produce all types of photographs.
Infants sleep about 16 hours a day, while teenagers need 9 hours on average. For most adults, 7 to 8 hours a night appears to be the best amount of sleep, although some people may need as few as 5 hours or as many as 10 hours of sleep each day.
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.