In simple terms, DHCP determines if your IP is static or dynamic and the length of time an IP address is assigned. Dynamic Host Configuration Protocol is controlled by a DHCP server. Your router can be a DHCP server...and if you're on a home network, it most likely serves this purpose.
Researchers report that the average adolescent needs eight and a half to nine and a half hours of sleep each night. But in a poll taken in 2006 by the National Sleep Foundation, less than 20 percent reported getting that much rest on school nights.
Most adults need between six and nine hours of sleep each night. Some people can feel perfectly rested with a lower amount. Newborn babies can sleep for 16 hours a day, while school age children need an average of 10 hours. Most people over the age of 70 tend to be light sleepers and need less than six hours a night.