Feeling blue may not be all bad when it comes to enjoying a good night's sleep.
Those with bedrooms this colour tend to get the best rest - nearly eight hours a night - and wake feeling happy and positive.
According to a survey, it is linked to calm, soothing feelings and is thought to slow the heart rate and even reduce blood pressure.
Green and yellow are also winners, with those choosing these colours clocking up roughly seven hours and 40 minutes of sleep.
However, it's best to avoid purple, which is too stimulating and can cut nightly hours of rest to under six. Grey and brown get the thumbs-down for being too dreary and depressing.