I also keep our windows closed at night! We have a cover of the kitchen drain but my husband isn't willing to do that in the bathroom (I bought it already!!)
I always keep our window close at night. Since they always come out near pipe/water area, pay more attention to kitchen and bathroom....see if there is any hole and cover it. Then use insect spray oftenly around the house and put 'cockroach house', which is very effective, as the cockroach will eat the poison food and pass the poison to the rest of their family.
If where you live is surrounded by food/cuisine then you better hire pest control regularly. I am really scare of cockroaches too
Why all men would feel we are troublesome to scare the cockroach?! They should try their best to help and provide us a safe home!!
I believe my husband won't agree with looking for professional too. :(
Have you ever thought of hiring the professional if the situation is that bad? Most people said it costs a few hundred and I think it would worth! It is better than being mad and crazy! I can't stand such pressure!! ><
I also will ask my husband to throw some old things away!! Once there are too many things allowing them hiding, I would be scared!