Yes, sadly, it's true; cockroaches spend time in our appliances both day and night. Stoves and refrigerators have nooks and crannies and in some cases warm, running motors that provide refuge during the sunlight hours and foraging at night. Water heaters are practically paradise because they provide a combination of water and warmth and are usually in areas hidden away from human traffic.
Small appliances on kitchen counters also attract cockroaches, and some favorite hangouts might be under or behind coffee makers, microwaves and blenders. And toasters, well, let's just say that shaking out more than the breadcrumbs is probably a good idea if you've seen any six-legged crawlers in your home.