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A bedbug (or bed bug) is a small nocturnal insect of the family Cimicidae that lives by hematophagy, or by feeding on the blood of humans and other warm-blooded hosts.

Biology

The common bedbug (Cimex lectularius) is the species best adapted to human environments. It is found in temperate climates throughout the world and feeds on human blood. Other species include Cimex hemipterus, found in tropical regions, which also infests poultry and bats, and Leptocimex boueti, found in the tropics of West Africa and South America, which infests bats and humans. Cimex pilosellus and Cimex pipistrella primarily infest bats, while Haematosiphon inodora, a species of North America, primarily infests poultry.[1]

Oeciacus, while not strictly a bedbug, is a closely related genus primarily affecting birds.

Adult bedbugs are reddish-brown, flattened, oval, and wingless, with microscopic hairs that give them a banded appearance. A common misconception is that they are not visible to the naked eye. Adults grow to 4–5 mm (1/8th – 3/16th of an inch) in length and do not move quickly enough to escape the notice of an attentive observer. Newly hatched nymphs are translucent, lighter in color and become browner as they moult and reach maturity. In size, they are often compared to lentils or apple seeds.

A recent paper by Professor Brian J. Ford and Dr Debbie Stokes gives views of a bedbug under various microscopes.

Feeding habits

Bedbugs are generally active just before dawn, with a peak feeding period about an hour before sunrise. However, they may attempt to feed at other times, given the opportunity, and have been observed to feed at any time of the day. Attracted by warmth and the presence of carbon dioxide, the bug pierces the skin of its host with two hollow tubes. With one tube it injects its saliva, which contains anticoagulants and anesthetics, while with the other it withdraws the blood of its host. After feeding for about five minutes, the bug returns to its hiding place. The bites cannot usually be felt until some minutes or hours later, as a dermatological reaction to the injected agents, and the first indication of a bite usually comes from the desire to scratch the bite site. Because of their dislike for sunlight, bedbugs come out at night.

Although bedbugs can live for a year or as much as eighteen months without feeding, they typically seek blood every five to ten days. Bedbugs that go dormant for lack of food often live longer than a year, well-fed specimens typically live six to nine months. Low infestations may be difficult to detect, and it is not unusual for the victim not to even realize they have bedbugs early on. Patterns of bites in a row or a cluster are typical as they may be disturbed while feeding. Bites may be found in a variety of places on the body.

Bedbugs have been erroneously associated with filth in the mistaken notion that this attracts them. Bedbugs are attracted by exhaled carbon dioxide and body heat, not by dirt, and they feed on blood, not waste. In short, the cleanliness of their environment has an effect on the control of bedbugs but, unlike cockroaches, does not have a direct effect on bedbugs as they feed on their hosts and not on waste. Good housekeeping in association with proper preparation and mechanical removal by vacuuming will certainly assist in control.

Location

Bedbugs travel easily and quickly along pipes and boards, and their bodies are very flat, which allows them to hide in tiny crevices. In the daytime, they tend to stay out of the light, preferring to remain hidden in such places as mattress seams, mattress interiors, bed frames, nearby furniture, carpeting, baseboards, inner walls, tiny wood holes, or bedroom clutter. Bedbugs can be found on their own, but more often congregate in groups. Bedbugs are capable of travelling as far as 100 feet to feed, but usually remain close to the host in bedrooms or on sofas where people may sleep.

Tips for traveler

Since most bedbugs are carried by travelers through contact with beds and hotel rooms in infected locations, following are some tips for those traveling to hotels that might be at risk.[citation needed]

1. First, examine the room for potential hiding places of bedbugs, such as carpet edges, mattress seams, pillow case linings, bedboards, wall trim or other tiny crevices in which bedbugs might hide.
2. Next, look specifically at the mattress seams for signs of bedbug activity: droppings, eggs, bloodstains or even bedbugs themselves, hiding in tiny folds and seam lines.
3. Keep a flashlight nearby when sleeping, to immediately observe suspected activity during the night without having to get up out of bed, thereby giving bedbugs time to hide in safety.
4. Never leave your clothing lying on the bed, or any location of possible infestation (as mentioned above). Instead, use hangers or hooks capable of keeping all cloth distant from the floor or bed. Suspend new shopping in bags the same way.
5. Close all luggage (suitcase, travel bag etc.) when you’re not using it. This way, during the night the bugs may move over the top of your bags and have difficulty getting inside.
6. Elevate your luggage off the floor to luggage stand, tables or chairs. These can also be hiding places, but they are not as likely to be.
7. Keep any bedbug you find (intact if possible) to show the hotel manager.

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Adult

The optimal amount of sleep is not a meaningful concept unless the timing of that sleep is seen in relation to an individual’s circadian rhythms. A person’s major sleep episode is relatively inefficient and inadequate when it occurs at the “wrong” time of day. The timing is correct when the following two circadian markers occur after the middle of the sleep episode but before awakening:

• maximum concentration of the hormone melatonin, and
• minimum core body temperature.

The National Sleep Foundation in the United States maintains that seven to nine hours of sleep for adult humans is optimal and that sufficient sleep benefits alertness, memory and problem solving, and overall health, as well as reducing the risk of accidents. A widely publicized 2003 study performed at the University of Pennsylvania School of Medicine demonstrated that cognitive performance declines with fewer than eight hours of sleep.

However, a University of California, San Diego psychiatry study of more than one million adults found that people who live the longest self-report sleeping for six to seven hours each night. Another study of sleep duration and mortality risk in women showed similar results. Other studies show that “sleeping more than 7 to 8 hours per day has been consistently associated with increased mortality”, though this study suggests the cause is probably other factors such as depression and socio-economic status which would correlate statistically. It has been suggested that the correlation between lower sleep hours and reduced morbidity only occurs with those who wake after less sleep naturally, rather than those who use an alarm.

Researchers from the University of Warwick and University College London have found that lack of sleep can more than double the risk of death from cardiovascular disease, but that too much sleep can also double the risk of death. Professor Francesco Cappuccio said: “Short sleep has been shown to be a risk factor for weight gain, hypertension and Type 2 diabetes sometimes leading to mortality but in contrast to the short sleep-mortality association it appears that no potential mechanisms by which long sleep could be associated with increased mortality have yet been investigated. Some candidate causes for this include depression, low socioeconomic status and cancer-related fatigue. In terms of prevention, our findings indicate that consistently sleeping around 7 hours per night is optimal for health and a sustained reduction may predispose to ill-health.”

Furthermore, sleep difficulties are closely associated with psychiatric disorders such as depression, alcoholism and bipolar disorder. Up to 90% of patients with depression are found to have sleep difficulties.

Hours by age

Children need a greater amount of sleep per day than adults to develop and function properly: up to 18 hours for newborn babies, with a declining rate as a child ages. A newborn baby spends almost 9 hours a day in REM-sleep. By the age of five or so, only a bit over two hours are spent in REM.

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Sleep is the natural state of bodily rest observed in animals. It is common to all mammals and birds, and is also seen in many reptiles, amphibians and fish. In humans, other mammals, and a substantial majority of other animals which have been studied, such as some species of fish, birds, ants and fruit-flies, regular sleep is essential for survival.

A widely publicized 2003 study performed at the University of Pennsylvania School of Medicine demonstrated that cognitive performance in humans declines with fewer than eight hours of sleep. However, the purposes of sleep are only partly clear and are the subject of intense research.

Human relaxation is the art and science of doing nothing - regardless of the outer activity including physical and/or mental tension. A human condition of flowing vital energy binging about a state of improved health and well being. Effective relaxation may be referred to as rejuvenation.

Sleep Timing

Sleep timing is controlled by the circadian clock, by homeostasis and in humans, within certain bounds, by willed behavior. The circadian clock, an inner time-keeping, temperature-fluctuating, enzyme-controlling device, works in tandem with adenosine, a neurotransmitter which inhibits many of the bodily processes that are associated with wakefulness. Adenosine is created over the course of the day; high levels of adenosine lead to sleepiness. In diurnal animals, sleepiness occurs as the circadian element causes the release of the hormone melatonin and a gradual decrease in core body temperature. The timing is affected by one’s chronotype. It is the circadian rhythm which determines the ideal timing of a correctly structured and restorative sleep episode.

Homeostatic sleep propensity, the need for sleep as a function of the amount of time elapsed since the last adequate sleep episode must be balanced against the circadian element for satisfactory sleep. Along with corresponding messages from the circadian clock, this tells the body it needs to sleep. Sleep offset, awakening, is primarily determined by circadian rhythm. A normal person who regularly awakens at an early hour will generally not be able to sleep much later than the person’s normal waking time, even if moderately sleep deprived.

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