Don't get too close to a tired teen
;you could start losing sleep as well.When one teenager starts sleeping less,
her friends and others in her social {{U}}(67) {{/U}} soon lose
sleep, too, according to new research. Our social networks can
{{U}}(68) {{/U}} our behaviors and moods. Political scientist James
Fowler of the University of California has studied these effects and previously
found that obesity, smoking, and {{U}}(69) {{/U}} happiness can spread
through networks of people {{U}}(70) {{/U}} based on their
relationships. Fowler {{U}}(71) {{/U}} his study of a
network of more than 8000 7th-to 12th-grade students and their sleeping and
smoking {{U}}(72) {{/U}}. He and colleagues {{U}}(73) {{/U}} a
web of connections between each student and his or her friends. In one of these
friend webs, a gang of sleepless boys {{U}}(74) {{/U}} the middle of the
mess, where the most {{U}}(75) {{/U}} kids landed--the so-called "cool"
kids. The researchers found that the {{U}}(76) {{/U}} central a teen
landed on the map, the greater chance that he or she got less than 7 hours of
sleep per night. Drug use was also contagious(具传染性的),
the team {{U}}(77) {{/U}}. Each smoking friend increased the (78
that a student used marijuana (大麻) {{U}}(79) {{/U}} 42%.
Both sleepless and drug-use contagions could still be felt four-degrees of
separation {{U}}(80) {{/U}}, influencing a friend of a friend of a
friend's friend. Most surprisingly, the researchers found a
link between {{U}}(81) {{/U}} of sleep and drug use. {{U}}(82)
{{/U}} a teen's friend slept less than 7 hours, her chances of using drugs
went {{U}}(83) {{/U}} by 19%. And that means that {{U}}(84)
{{/U}} sleeplessness spreads throughout a friend {{U}}(85) {{/U}},
drug use spreads as {{U}}(86) {{/U}} .