Since changing my diet a month ago to much healthier, loads of fruit/veg/protein i am clenching my jaw while i sleep most night. why would this be??

Common in females: Prevalence peaks in childhood and reaches its lowest rates in those over 65 years old. It is estimated that 8% of the adult population grind or clench their teeth at night. During the day, 20% of the general population report awareness of clenching their teeth. The same study found it was common in female .Intense concentration,Stress, anger or anxiety, Smoking, Stuffed nose, Excessive coffee