"The national penchant for watching television every evening before going to sleep, playing video games late into the night or checking emails and text messages before turning off the lights could be interfering with the nation's sleep habits.

"Unfortunately, cell phones and computers, which make our lives more productive and enjoyable, may be abused to the point that they contribute to getting less sleep at night leaving millions of Americans functioning poorly the next day," Russell Rosenberg, the vice chairman of the Washington DC-based National Sleep Foundation NSF.L, said in a statement.

Nearly 95 percent of people questioned in an NSF study said they used some type of electronics in the hour before going to bed, and about two-thirds admitted they do not get enough sleep during the week..."