Psychologists' claims indicate that ensuring your wooden beds are in a dark room allows you to overcome the negative effects of staying up late. Sleeping with too much light in your bedroom can cause depression and changes to the brain, research using hamsters has revealed. A report published in the Molecular Psychiatry journal revealed that even just the glow from leaving the television on while you sleep can be enough to cause the effect. A link has been made with the rising rates of depression in humans over the past 50 years. Neuroscientist Tracy Bedrosian, from Ohio State University, said: "The results we found in hamsters are consistent with what we know about depression in humans". She added: ‘The good news is that people who stay up late in front of the television and computer may be able to undo some of the harmful effects just by going back to a regular light-dark cycle and minimising their exposure to artificial light at night. That’s what the results we found in hamsters would suggest.’ So you can stay up a little later tonight as long as the television goes off when you get into bed!