Congestion caused by allergies can greatly impact the quality of our sleep, which in turn can have a knock-on effect on our physical and mental health. Here, an expert shares her top tips on how best to tackle a lack of shut-eye brought on by hay fever symptomsCongestion caused by allergies can greatly impact the quality of our sleep, which in turn can have a knock-on effect on our physical and mental health. Here, an expert shares her top tips on how best to tackle a lack of shut-eye brought on by hay fever symptoms