Usually, REM sleep happens 90 minutes after you fall asleep. The first period of REM typically lasts 10 minutes. Each of your later REM stages gets longer, and the final one may last up to an hour. Your heart rate and breathing quickens. You can have intense dreams during REM sleep, since your brain is more active. Babies can spend up to 50% of their sleep in the REM stage, compared to only about 20% for adults.
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There are three general classes of media types: coaxial cable, twisted pair and fiber optic cable. Coaxial cable had suffered waning popularity, but is making a bit of a comeback with cable modem solutions. There are two types of fiber-optic cable: multi mode fiber and single mode fiber. Twisted pair is the most common type of computer network cabling. Twisted pair can be classified according to the value of the intrinsic impedance of the wire, and whether it is shielded or unshielded. Unshielded twisted pair, with an intrinsic impedance of 100 ohms, is the most common type of computer network cabling used today.