Your choices of colour for your home can profoundly impact how the space feels. The colour wheel can be used to understand how to combine colours in unique and vibrant ways. Complementary colours opposite each other on the wheel, like blue and orange, create high contrast and energy. Monochromatic schemes use different shades of one colour, while analogous schemes combine a primary colour with the two colours on either side. A study found that bedrooms painted blue led to the longest sleep, as blue may help lower heart rate and blood pressure, whereas purple was too stimulating for restful sleep. Colour selection is important for achieving the right mood and quality of rest.