I like to sleep with my small windows open, unfortunately next door neighbour's cat thinks its an invitation for her to join us too. Whilst I love all furries, being allergic don't want her in my home. I could get hubby to make little mesh net panels in a wooden frame, but would have to take these off each morning, plus find a way of fixing them in place, which would be a nightmare as our home is made of concrete panels (we usually have to drill holes to hang pictures). I wonder if anymore knows of some essential oils etc, that I could drop just inside the window opening to deter cat, I just want something that isn't over powering to me and won't hurt but deter cat. Any advice welcome, fed up of chucking cat out of home in the wee hours.