The average adult requires 7 to 8 hours of sleep daily. According to the National Sleep Foundation (NSF) 2005 Sleep in America Poll, 40% of the respondents reported <7 hours of sleep on weekdays. The survey also noted that 14% of Americans perform shift work that goes against the body's natural circadian rhythm. Moreover, most diets contain a great deal of caffeine, which remains in the body for an average of 3 to 5 hours but can continue to affect individuals for up to 12 hours.
Another NSF poll found that 36% of the 1000 Americans surveyed reported a current sleep problem, 27% reported occasional insomnia, and 9% reported chronic insomnia. On average, the individuals with occasional insomnia had had difficulty sleeping for 9.3 years, compared with 13 years for individuals with chronic insomnia.Work-related stress was the most frequent reason for insomnia among individuals with occasional insomnia. Family-related stress, however, was the most common cause for individuals with chronic insomnia.
In Seniors: Consider CMV Serostatus
When Recommending Flu Vaccine
Older people who have cytomegalovirus seem to have less robust responses to the trivalent influenza vaccine than those who do not have CMV.
News from the year's biggest meetings
Clinical features with downloadable PDFs