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.
Keep in mind that it takes approximately 15 minutes to fall asleep when scheduling your sleep. How Much Sleep do you need? Rest and renewal only comes during the REM stages, the more rest you need translates in to needing more time spent in the REM stages of sleep.