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.
Our sleep need varies with our age. Infants will typically need 16 hours of sleep each day; while toddlers (ages 1-3) may need between 10-12 hours of sleep; and by the teenage years, this can decrease to 9-11 hours of sleep a night. As adults, how much sleep we need per night can vary from 6-10 hours, but most experts seem to recommend 7-8 hours per night.