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 an average of eight hours of restful sleep per night. But this varies by individual. The best way to determine the right amount of sleep for you is to spend one week waking up naturally without an alarm clock. At the end of the week, average out the amount of sleep you received each night.