Claim: Flashing night-lights may help lessen jet lag, circadian problems
Verdict: SUPPORTS

Retrieved passages:
title: Jet lag
text: people match their circadian rhythms with the expected cycle at their destination; it requires strict adherence to timing. Light therapy is a popular method used by professional athletes to reduce jet lag. Special glasses, usually battery-driven, provide light to the eyes, thus inhibiting the production of melatonin in the brain. Timed correctly, the light may contribute to an advance or delay of the circadian phase to that which will be needed at the destination. The glasses may be used on the plane or even before users leave their departure city. Timed melatonin administration may be effective in reducing jet lag

title: Jet lag
text: drink. It does not necessarily involve the shift in circadian rhythms that cause jet lag. Travel fatigue can occur without crossing time zones, and it often disappears after one day accompanied by a night of good quality sleep. Jet lag is a chronobiological problem, similar to issues often induced by shift work and the circadian rhythm sleep disorders. When travelling across a number of time zones, the body clock (circadian rhythm) will be out of synchronisation with the destination time, as it experiences daylight and darkness contrary to the rhythms to which it has grown accustomed. The body's natural pattern

title: Circadian rhythm
text: NTSB cites this as contributing to many accidents and has conducted several research studies in order to find methods of combating fatigue in pilots. Disruption to rhythms usually has a negative effect. Many travelers have experienced the condition known as jet lag, with its associated symptoms of fatigue, disorientation, and insomnia. A number of other disorders, for example bipolar disorder and some sleep disorders such as delayed sleep phase disorder (DSPD), are associated with irregular or pathological functioning of circadian rhythms. Disruption to rhythms in the longer term is believed to have significant adverse health consequences on peripheral organs outside

title: Jet lag
text: symptoms. The benefit of using melatonin is likely to be greater for eastward flights than for westward ones because for most people it is easier to delay than to advance the circadian rhythm. There remain issues regarding the appropriate timing of melatonin use in addition to the legality of the substance in certain countries. How effective it may actually be is also questionable. For athletes, anti-doping agencies may prohibit or limit its use. Timing of exercise and food consumption have also been suggested as remedies, though their applicability in humans and practicality for most travellers are not certain, and no

title: Sleep inversion
text: no longer exhibit symptoms. For people who travel often, it is preferable to adjust to the new time zone by sleeping at times appropriate to that zone if they intend to be there for one week or longer. Diets that target jet lag are also effective for some people, and light therapy, which involves exposure to a lighted device to simulate daytime, may be helpful to some people too. People with the shift work type of the disorder benefit most from a non-changing work schedule. If rotating or changing shifts are unavoidable, rotations that occur in a clockwise direction, where

title: Jet lag
text: causes more problems than travelling west because the body clock has to be advanced, which is more difficult for the majority of humans than delaying it. Most people have an endogenous circadian rhythm that is longer than 24 hours, so lengthening a day is less troublesome than shortening it. Equally important, the necessary exposure to light to realign the body clock does not tie in with the day/night cycle at the destination. Travelling east by six to nine time zones causes the biggest problems, as it is desirable to avoid light in the mornings. Waterhouse et al. recommend: Travelling by

title: Jet lag
text: a circadian rhythm that is out of sync with the day-night cycle of the destination, as well as the possibility of internal desynchronisation. Jet lag has been measured with simple analogue scales, but a study has shown that these are relatively blunt for assessing all the problems associated with jet lag. The Liverpool Jet Lag Questionnaire was developed to measure all the symptoms of jet lag at several times of day, and this dedicated measurement tool has been used to assess jet lag in athletes. Jet lag may require a change of three time zones or more to occur, though

title: Jet lag
text: research results on their success at adapting to jet lag are inconsistent. For time changes of fewer than three hours, jet lag is unlikely to be a concern, and if travel is for short periods (three days or fewer) retaining a "home schedule" may be better for most people. Sleeping on the plane is only advised if it is within the destination's normal sleep time. Jet lag may affect the mental health of vulnerable individuals. When travelling across time zones, there is a "phase-shift of body temperature, rapid-eye-movement sleep, melatonin production, and other circadian rhythms". A 2002 Israeli study found

title: Jet lag
text: SCN's role is to send signals to peripheral oscillators, which synchronise them for physiological functions. The SCN responds to light information sent from the retina. It is hypothesised that peripheral oscillators respond to internal signals such as hormones, food intake, and "nervous stimuli". The implication of independent internal clocks may explain some of the symptoms of jet lag. People who travel across several time zones can, within a few days, adapt their sleep-wake cycles with light from the environment. However, their skeletal muscles, liver, lungs, and other organs will adapt at different rates. This internal biological de-synchronisation is exacerbated as

title: Sleep
text: these are its main clues about what time it is. Exposure to even small amounts of light during the night can suppress melatonin secretion, and increase body temperature and wakefulness. Short pulses of light, at the right moment in the circadian cycle, can significantly 'reset' the internal clock. Blue light, in particular, exerts the strongest effect, leading to concerns that electronic media use before bed may interfere with sleep. Modern humans often find themselves desynchronized from their internal circadian clock, due to the requirements of work (especially night shifts), long-distance travel, and the influence of universal indoor lighting. Even if

title: Jet lag
text: contribute widely to the issue. The symptoms of jet lag can be quite varied, depending on the amount of time zone alteration, time of day, and individual differences. Sleep disturbance occurs, with poor sleep upon arrival and/or sleep disruptions such as trouble falling asleep (when flying east), early awakening (when flying west), and trouble remaining asleep. Cognitive effects include poorer performance on mental tasks and concentration; increased fatigue, headaches, and irritability; and problems with digestion, including indigestion, changes in the frequency of defecation and consistency of faeces, and reduced interest in and enjoyment of food. The symptoms are caused by

title: Jet lag
text: bright light to the eyes can speed adjustment to a new time zone. The hormone melatonin is produced in dim light and darkness in humans, and it is eliminated by light. North–south flights that do not cross time zones do not cause jet lag. However, crossing of the Arctic Ocean or even the North Pole (often the shortest route between northeast Europe and Alaska or the Canadian West Coast and East Asia) does cause a significant time change. Jet travel from Alaska to northeast Europe causes a pattern of jet lag very similar to an eastward flight at lower latitudes.

title: Shift work sleep disorder
text: or first part of the night, and bright light should be avoided in the morning. Wearing dark goggles (avoiding bright light) or blue-blocking goggles during the morning commute home from work can improve circadian adaptation. For workers who want to use bright light therapy, appropriate fixtures of the type used to treat winter depression are readily available but patients need to be educated regarding their appropriate use, especially the issue of timing. Bright light treatment is not recommended for patients with light sensitivity or ocular disease. Melatonin is a hormone secreted by the pineal gland in darkness, normally at night.

title: Jet lag
text: that relapse of major affective and psychotic disorders occurred more frequently when seven or more time zones had been crossed in the past week than when three or fewer had been crossed. Although significant disruptions of circadian rhythms had been documented as affecting individuals with bipolar disorder, an Australian team studied suicide statistics from 1971 to 2001 to determine whether the one-hour shifts involved in daylight saving time had an effect. They found increased incidence of male suicide after the commencement of daylight saving time but not after returning to standard time. Jet lag Jet lag is a physiological condition

title: Jet lag
text: firm guidelines exist. There are very little data supporting the use of diet to adjust to jet lag. While there are data supporting the use of exercise, the intensity of exercise that may be required is significant, and possibly difficult to maintain for non-athletes. These strategies may be used both before departure and after landing. Individuals may differ in their susceptibility to jet lag and in how quickly they can adjust to new sleep-wake schedules. Short-acting sleep medications can be used to improve sleep quality and timing, and stimulating substances such as caffeine can be used to promote wakefulness, though

title: Light effects on circadian rhythm
text: colorectal cancer. "In 2007, the International Agency for Research on Cancer classified shift work with circadian disruption or chronodisruption as a probable human carcinogen." Exposure to light during the hours of melatonin production reduces melatonin production. Melatonin has been shown to mitigate the growth of tumors in rats. By suppressing the production of melatonin over the course of the night rats showed increased rates of tumors over the course of a four week period. Artificial light at night causing circadian disruption additionally impacts sex steroid production. Increased levels of progestagens and androgens was found in night shift workers as compared

title: Sleep inversion
text: It is the timing of their sleeping and waking that is persistently delayed. The jet lag type of circadian rhythm sleep disorder is characterized by disruptions arising from a mismatch between a person's circadian cycle and the cycle required by a different time zone. The more time zones that are traveled, the greater the disruption. Eastbound travel, in which sleep-wake hours are advanced, typically causes more problems than westbound travel, in which sleep-wake hours are delayed. People who travel often and cross many time zones when they travel are most susceptible to this type. The shift work type of circadian

title: Jet lag
text: 10 hours or more is usually best managed by assuming it is a 14-hour westward transition and delaying the body clock. A customised jet lag program can be obtained from an online jet lag calculator. These programs consider the sleep pattern of the user, the number of time zones crossed, and the direction of travel. The efficacy of these jet lag calculators has not been documented. Travelling west causes fewer problems than travelling east, and it is usually sufficient to seek exposure to light during the day and avoid it at night. Timed light exposure can be effective to help

title: Artificial sunlight
text: productivity. This technology is known as full-spectrum lighting. Artificial sunlight is found useful in treating and preventing Seasonal affective disorder (also known as "winter depression", which brings about depressive symptoms specifically in winter), and Delayed sleep phase syndrome, in which the circadian (day V/s night)-rhythm is disturbed, and the individual tends to fall asleep much later than they would desire. Artificial sunlight may also be useful in prevention, or minimizing the severity of jet lag. Different corals in a reef aquarium require different lighting conditions. Most of the corals are symbiotically dependent upon zooxanthellae—a type of algae. It is the

title: Jet lag
text: Jet lag Jet lag is a physiological condition which results from alterations to the body's circadian rhythms caused by rapid long-distance trans-meridian (east–west or west–east) travel. For example, someone flying from New York to London, i.e. from west to east, feels as if the time were five hours "earlier" than local time and said person traveling from London to New York, i.e. from east to west, feels as if the time were five hours "later" than local time. Jet lag was previously classified as one of the circadian rhythm sleep disorders. The condition of jet lag may last several days