Once, the only way you could supposedly influence your dreams was by regulating your cheese consumption before bed.
These days, however, things are little more hi-tech. Scientists have invented a phone app they claim lets you create your perfect dream, by playing a ‘soundscape’ that subliminally influences the sleeping mind.
Users can take their pick from peaceful rural settings, busy street scenes, or even dramatic adventures set in space.
While it may sound rather like a sinister plot from a science fiction film, Professor Richard Wiseman, who helped develop the programme, believes it could aid those who suffer from sleeping disorders or depression.
The Hertfordshire University psychologist plans to collect thousands of records from users of the app as part of a mass experiment for the Edinburgh International Science Festival to find out how easy it is to influence dreams.