Most Americans are doing one nightly activity that's wrecking their sleep, expert says

If you’re not sleeping well, there could be a variety of reasons — but one habit stands out as the biggest culprit.

Dr. Wendy Troxel, a licensed clinical psychologist and senior behavioral scientist at RAND based in Utah, revealed that phone use at night is the activity that is most likely to have a negative effect on slumber.

"Most people are aware of this, but probably the No. 1 habit that's contributing to interrupted sleep, and poor-quality sleep, in Americans is the use of phones at night...