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Tomorrow Today

Sound Sleep - why television keeps you awake

Blue light can stop you from sleeping, and a Swiss team of researchers have now confirmed that this includes television screens. Large amounts of blue light are emitted from blue backlit screens, strongly influencing the circadian rhythm when it is processed by special light receptors in the eye.

The researchers measured brain waves and the levels of the sleep hormone melatonin and discovered that light from the screens delays the build-up of melatonin by an hour. So staring at an iPad before bed turns out not to be a good idea.