Neighbour taking pictures

Im just wondering if I can get any information on why my neighbour on Hayward Ave (I wont reveal the number) is constantly taking pictures of my home and those surrounding it through his window? That particular vantage point sees into my bedroom and bathroom and I have been watching him do this for several weeks now. Considering the part of my home this looks into it causes me great distress to be worried about being photographed in my bedroom and bathroom. I should not have to worry about being watched in my own home.