Watching TV, checking email, phone or iPad evening before going to bed (or the same), can disrupt sleep, according to a study released today by the National Sleep Foundation in the United States.
The foundation conducted annually by a survey on sleep habits found that 43% of Americans between 13 and 64 say they rarely or never sleeps well at night during the week.
The study found that the use of communications technology before sleep is a widespread phenomenon.
Almost all respondents, 95% said they watch TV or use some type of electronic device like a computer, a gaming console or mobile phone at least an hour before bedtime.
The mobile phone has also become a focus of sleep disturbance, and that about one in ten young people between 13 and 18, says they are awake all or most nights for a text message, a call phone or email.
Two thirds of respondents said that during the week did not get the sleep you need to be rested.
Most said they need between seven and seven and half hours sleep to feel good but, on average, six hours and 55 minutes.
15% of the respondents between 19 and 64 years and 7% among young people between 13 and 18 say they sleep less than six hours during the week.
"This survey examines the association between the use of U.S. new communication technologies and their sleeping habits," said David Cloud, director of the National Sleep Foundation.
"While these technologies have become commonplace, it is clear that we must learn more about proper use and leave the room to complete some good sleep habits," he added.
Another discovery is that Americans also take short naps to combat daytime sleepiness, in addition to the classic remedy of drinking coffee.
In the United States an average person drinks a liter of coffee a day and hardly any difference between different age groups studied.
Drowsiness is dangerous when driving, says the foundation.
50% of respondents between 19 and 29 years admitted that he had driven while sleepy at least once in the last month.
More than a third of Generation X (between 30 and 45), 40% said they had, while only 28% of "baby boomers" (between 46 and 64) did.
The National Sleep Foundation began to analyze the sleep habits of Americans in 1991.
The 2001 annual survey was conducted by the consulting WB & A Market Research on a sample population of 1,508 randomly selected, aged between 13 and 64 years and has a margin of error of 2.5 percentage points.