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London: Using tablet computers just before going to bed can lead to a poor night`s sleep due to the suppression of a sleep-inducing chemical, a new study has found. The study found that a large number of people are taking their tablets to bed with them to surf the web, check Facebook or email before switching off the light. Researchers, however, have warned that the blueish light emitted by the screens can stop users getting a good night`s sleep, `The Telegraph` reported. It is because this type of light mimics daylight, convincing the brain that it is still daytime. Blue light suppresses production of a brain chemical called melatonin, which helps us fall sleep. This is because our brains have evolved to be wakeful during daylight hours, the report said. By contrast, light which is more orange or red in tone does not suppress melatonin production, perhaps because our brains recognise it as a cue that the day is ending. Neurologists have known for years that starin...