by Allison Aubrey
June 7, 2010
New research adds to a growing body of evidence showing the
perks of a good night's sleep.
A study from researchers at Stanford University finds that extra
hours of sleep at night can help improve football players'
performance on drills such as the 40-yard dash and the 20-yard
shuttle.
"The goal was to aim for 10 hours of sleep per night," says
Cheri Mah of the Stanford Sleep Disorders Clinic. At the beginning
of the season, Mah found that the players had moderate levels of
daytime fatigue, even though they thought they were getting enough
rest at night. Seven players were included in the study.
It's not easy to convince college students to add hours of sleep
to their schedules each day. "It's a lot to ask," Mah says, but
throughout the season she was able to document a significant
extension of nighttime sleep.
Early in the season, the players' average 40-yard dash time was
4.99 seconds. But after six weeks of extra ZZZs, the average time
dropped one-tenth of a second — to 4.89 seconds.
"That could mean millions in the NFL," says Dr. Tim Church of
the Pennington Biomedical Research Center at Louisiana State
University. "A tenth of a second is a huge, huge difference from a
performance standpoint."
As the players' performance on drills improved with the extra
sleep, their levels of daytime fatigue dropped dramatically. And
the scores on vigor tests improved, too.
"It's not a surprise," Church says. He adds that the players'
workouts are so extreme and intense that "when you give them a
little extra time to recover, you see additional benefits."
It's hard to say how the connection between more sleep and
improved physical performance may translate to weekend warriors —
or middle-age folks who are just trying to hold onto a nine-minute
jogging pace.
The take-home message here, Church says, is that this is just
one more example of how sleep makes a difference.
Sleep And Preschool Success
The benefits of adequate sleep extend far beyond what's now
being documented on athletic performance. And when it comes to
teaching good sleep hygiene, it seems parents can never start too
early.
One new study that explored the sleep habits of preschool-age
children finds that bedtime rituals and rules play a unique role in
the development of 4-year-olds.
"This is a good time to look at things like early learning and
brain development," says researcher Erika Gaylor of SRI
International, a nonprofit research institute in Menlo Park,
Calif.
She analyzed a federal survey of some 8,000 families in which
parents were asked a slew of questions about bedtime. The survey
was ongoing — from the time their kids were 9 months old through
the start of kindergarten. Parents were surveyed several times
throughout this period.
The researchers asked questions such as, "What time does your
child go to bed?" and "Do you as parents have a rule about
bedtime?" Researchers followed up with home visits, during which
they conducted one-on-one assessments to measure math and language
skills.
"What was really surprising was that having a rule about bedtime
was associated with higher scores on language and math skills,"
Gaylor says.
Children of parents who reported having a rule about bedtime
scored about 6 percentage points higher on an assessment of their
vocabulary compared with children whose parents did not report a
rule about bedtime. They scored 7 percent higher on assessments of
early math skills.
They were small but significant differences. And researchers say
the study is yet another example of the power of a good night's
sleep.
Both of these studies are being presented this week at the
annual SLEEP conference, which is a joint venture of the American
Academy of Sleep Medicine and the Sleep Research Society.
