As one of the hundreds of souls who have become victims to that natural creature with unnatural invulnerability, you\u2019re probably thinking of ways you can eradicate cockroaches from your home. One of the things you need to know is when roaches are active.\n\n\n\nThe American cockroach, Periplaneta Americana, follows an internal twenty-four-hour circadian rhythm where they roam to find food, drink water, and reproduce with other cockroaches for four hours, and then return to their hiding places to rest for the next twenty hours.\n\n\n\nThe idea that roaches are only out for four hours must be pretty hard to believe for you thanks to the well-earned reputation of cockroaches being unstoppable swarms that appear everywhere at all times. But in spite of that reputation, cockroaches are actually pretty lazy. If you want to learn when your twenty-hour opportunity is for catching these creepy crawlies at their most vulnerable, then read on.\n\n\n\nDo Cockroaches Sleep?\n\n\n\nIt might be a surprise to you that cockroaches sleep at all. Once your home is infested with cockroaches, they seem to be ever-present from that point on until you\u2019re finally able to have them exterminated.\n\n\n\nThe fact is, cockroaches don\u2019t sleep. At least, they don\u2019t sleep in the sense we have always known sleeping to be. After all, they don\u2019t have eyelids with which to shut.\n\n\n\nHowever, according to the cockroach guide, cockroaches do follow a circadian rhythm. This means that they follow a pattern in their activity that repeats about every 24 hours. They have specified lengths of time dedicated to being active and then they go into dedicated periods of inactivity like we would normally do with true sleeping.\n\n\n\nThe difference is that their period of inactivity doesn\u2019t send them into a sound slumber. Instead, they just become immobile for an extended period of time, which we\u2019ll look at in more detail shortly.\n\n\n\n\n\n\n\nWhen Do Cockroaches Sleep?\n\n\n\nSo when are cockroaches inactive? As nocturnal creatures, they fall into inactivity during the day to recuperate and renew their strength for the next evening. Still, even though we know that roaches have their circadian rhythm, having people who have seen these things at various hours makes us wonder if they have a strict rhythm and follow a regular schedule.\n\n\n\nDo we need to worry about these things all hours of the night as some are awake and others aren\u2019t, or can we expect them at a certain time? Afterall, we break our rhythm on a regular basis, so why not cockroaches?\n\n\n\nWell, a study conducted by Shepherd K. Def. Roberts showed that the American cockroach - the cockroach most of us are familiar with and despise - has its circadian rhythm controlled via its brain, just like we do.\n\n\n\nThis means that specific functions in their body that pertain to eating, resting, and reproducing are controlled by the set cycles dictated by their brain. In humans, studies show that the hypothalamus in the brain is associated with our circadian rhythm because of the suprachciasmatic nucleus, which is connected to our optic nerves, and able to respond to the input of light and darkness.\n\n\n\nIf the cockroach\u2019s internal \u201cclock\u201d functions similarly, then the absence of light in its eyes would prompt their equivalent of a suprachiasmatic nucleus to send signals to their body to start waking up and getting a move on.\n\n\n\nThe problem with this is that roaches hide in dark cavities, so how would constant darkness let them know it\u2019s time to look for food and water? This suggests that cockroaches live by a consistent schedule because their brains have a strict circadian rhythm. This means you can also rely on a pretty faithful time that cockroaches come out.\n\n\n\nWhat Time Do Cockroaches Come Out?\n\n\n\nNow that we\u2019ve established that cockroaches are nocturnal, we come to the aspect about cockroaches that make them sheer menaces. When do they actually invade your space?\n\n\n\nBeing active at night is a good way to protect themselves from potential threats like us, since these threats are asleep. It definitely isn\u2019t their camouflage that helps them. Once they feel it\u2019s safe to come out, they will be active in your home for about four hours to find food and water and also mate.\n\n\n\nCockroaches come out when you have turned out all the lights and go to bed. Their internal clocks are set to make sure they come out when the house is completely dark and quiet before beginning their nightly raid. Once they come out, they\u2019ll only be scurrying about for four hours.\n\n\n\nFour hours is all the time a cockroach needs to find food because they are genetically efficient at it\/ What I mean is they have 150 olfactory receptors in their body that make it easy to sense where food is and 500 gustatory receptors that allow them to digest just about anything they find. These two receptors make it easy for these pests to find food, be it your dinner leftovers on dishes that you haven\u2019t washed, rotting remnants in your garbage can, or one another if things get hard.\n\n\n\nDepending on the size of the colony that has laid claim to your dwelling, you might find a few \u201cscouts,\u201d coming out to do their business or a swarm. When the cockroaches have come to the end of their four-hour workday, they return to their lairs in the cracks and crevices of your house and fall into another phase of immobility. Then the cycle repeats.\n\n\n\nHow Many Hours do Cockroaches sleep?\n\n\n\nSince these nuisances actually have a reliable internal clock for us to estimate when they will come out, we can fairly estimate how long they sleep. Being only active for four hours, these literal buggers that plague the lives of homeowners, are asleep for 20 hours out of the day! That\u2019s an unbelievable amount of time considering how much aggravation they\u2019re able to cause you in the four hours they\u2019re awake!\n\n\n\nThere are also some unanswered questions, like if roaches are only awake for four hours right after the sun goes down, then why do so many people encounter them at different times, or even during the day too?\n\n\n\nWell, if you move about during the night to get a midnight snack, or because you need the bathroom, you can encounter them at varying times by disturbing the places where they were trying to hide, waking them up, and causing them to scurry.\n\n\n\nAs for the daytime, many victims of these insects have in fact seen them out during the daytime, and the reason for that resembles us when we wake up during the middle of the night for a midnight snack. Yep! When roaches don\u2019t get enough food during their night excursions, they have to wake up and look again.\n\n\n\n\n\n\n\nSo, if you\u2019ve been dealing with an infestation of cockroaches and you suddenly find them coming out during the day, this is actually a good sign. It means they\u2019re not able to find food easily, which helps make your home unsuitable for them. However, don\u2019t throw away the business card of your local exterminator yet, because a single cockroach can live several weeks to a month without food.\n\n\n\nConclusion\n\n\n\nIt\u2019s pretty astounding that the American cockroach isn\u2019t actually as hyperactive as it feels they are, isn\u2019t it? In such a short amount of time, they are able to riddle our homes with filth. Of course, it is filth and moisture that attracts them, so if you do find them crawling around your floors and cabinets, consider really deep cleaning everything.