Home > Newsletters > Daily: Love or hate Earth Hour? > Daily Dose: This is why your vanilla or cinnamon flavoured e-cigarette is toxic > Health-in-Motion 27 November 2017 The many electronic screens we watch on a daily basis are bad for our sleep. The many electronic screens we watch on a daily basis are bad for our sleep. Devices like smartphones, computer screens and tablets emit blue light which is known to suppress the production of a hormone called melatonin that is associated with sleep and the normal functioning of our body cycles. A recent study shows that this kind of light has a detrimental impact, not only on the duration of sleep, but also on its quality. Screens that emit red light, by contrast, do not have these negative effects. 0 NEXT ON HEALTH24X 'Help! My baby's cough sounds like a dog's bark' 2019-08-24 10:00 More: Daily Dose: This is why your vanilla or cinnamon flavoured e-cigarette is toxicHealth-in-Motion advertisement Other news Medical 10 things to know about your vagina that'll change how sex feels Mental health How toes become fingers in the brains of 'foot painters' Mental health Lots of time on social media linked to anxiety and depression in teens Medical Why obese teen boys could be prone to heart attacks in middle age Diet and nutrition WATCH: Science has discovered that cheese is as addictive as cocaine Medical WATCH - Why loud chewing has kept this man from talking to his family for years Live healthier Heart health » 5 women share exactly what it feels like to have a heart attack 'I felt like I had a pill stuck in my throat.' Diet & Nutrition » 8 benefits of gherkin juice that will make you want to drink some ASAP Goodbye, salt craving.