The Dyson Purifier HEPA Cool Formaldehyde fan has been a game changer in terms of sleep quality for OK! head of shopping Zoe – and it’s currently £150 off in the Dyson Deals Week The Dyson Purifier HEPA Cool Formaldehyde fan has been a game changer in terms of sleep quality for OK! head of shopping Zoe – and it’s currently £150 off in the Dyson Deals Week Lifestyle