Laptops, tablets and mobile phones produce blue light and just half an hour's use before bed has been shown to delay good REM sleep by a corresponding thirty minutes. Using these devices before bed to wind down or relax can send a very different message to your brain, resulting in you staying awake longer and disrupting your natural circadian rhythms leading to a host of health issues.

Listen in as Alice Hoagland, Ph.D explains the importance of a good nights sleep.