A new study suggests that sleep disturbances and undiagnosed sleep apnea are common among middle-aged and older adults, and these sleep problems occur more frequently among racial/ethnic minorities

After adjustment for sex, age, and study site, blacks were most likely to have short sleep duration of less than six hours, and they were more likely than whites to have sleep apnea syndrome, poor sleep quality, and daytime sleepiness. Hispanics and Chinese were more likely than whites to have sleep-disordered breathing and short sleep duration, but Chinese were least likely to report having insomnia.