But, says Rousell, despite a large body of research into the properties of different colours, the best option for your home is still somewhat contextual, depending on your background, economic upbringing and the climate you live in. “People always ask me, ‘what is the best colour for sleep?’, but that depends not just on the sensory input that’s coming in but also your lived experience, which acts as a filter that all this sensory input has to pass through,” she says.