It is best to control the use of smartphones if it means getting a sound sleep at nighttime to optimize energy and performance levels the next day. Research shows that light coming from smartphones greatly affects the quality and duration of your sleep each night.

According to UPI, this recent study was conducted for a month letting the participants use their phones for 38 hours on average. It has been observed that the more time the participants spend some screen-time, the less sleep they get with poor rest quality.

"A substantial amount of our time is spent engaging with smartphones," said study senior researcher Dr. Gregory Marcus. "These may have important health effects, including influencing fundamental needs, such as our ability to acquire and maintain a good night's sleep," added Marcus.

This problematic sleep pattern is also linked to such health problems as depression, diabetes and obesity, as noted by the authors of the study. However, Marcus gives caution that this study didn't exactly prove the smartphones' negative effects to sleep. It's just that they seemed to be closely associated.

On the other hand, various studies reveal that the electronic devices' blue light may over stimulate the brain. This gives you poor sleep in return.

A recent study about children's sleep pattern and mobile devices has been reported in MinnPost. Light coming from mobile devices in a child's bedroom resulted to poor sleep during nighttime and increases daytime sleepiness.

This is not just true to children but even to adults too. Sleep deficiency affects daytime performance, and both physical and emotional health.

"Sleep quality plays a critical role in our health and well-being. Given how pervasive mobile devices are today, we need to know how much of an impact our use of these and other backlit technologies has on our sleep quality," Kristen Knutson, a National Sleep Foundation researcher said.