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30.10 News Feature Sleep MH J. FEINGERSH/CORBIS Restless nights, listless days More and more people’s working and social lives are blighted by skewed sleep patterns. Is it time for the medical mainstream to take notice of what neuroscientists are learning about the body clock? Alison Abbott reports. s thousands of researchers from Jetlag is just one example of a disruption rhythms. What’s more, the basic tempo of Europe and Asia join their American to circadian rhythms.Your body clock can be the cycle is fixed — it can’t get much faster or Acolleagues in New Orleans next week upset by disease, seasonal changes in day slower — even in the absence of external cues for the annual Society for Neuroscience length,and even ageing — causing sleep pat- that signal the time of day. conference, much of the café talk will terns to shift from the norm.You can also run The workings of circadian clocks are revolve around jetlag and the merits of into problems if you try to ignore your bio- gradually being revealed, right down to their melatonin. Does taking this hormone really logical rhythms, for example when working molecular nuts and bolts. Central to the help us to adjust more quickly to a new night shifts.But circadian biologists are find- timekeeping mechanism are the SCN, which time zone? ing that broken body clocks can, in some comprise two clusters of 50,000 neurons,one At least neuroscientists should be able to cases, be mended. They are now calling on on each side of the brain.A dozen or so time- get an informed opinion. Their discipline governments to recognize the societal keeping genes — with names such as Period, includes specialists who study the body’s importance of their work,and to provide the Clock and Crytochrome — have been identi- daily, or circadian, rhythms. And the good funding needed to move the field from its fied in the human SCN over the past few news, from a recent analysis of the few stud- current fringe status into the mainstream of years. Together, they orchestrate the daily ies that have investigated the effects of mela- medicine. cycle of sleep and wakefulness. The genes are tonin, is that it does help to reset weary trav- When your biological clock is running periodically switched on and off by complex ellers’body clocks1. The hormone is secreted smoothly,body temperature and the levels of feedback loops that are influenced by our from the brain’s pineal gland during dark- various hormones,such as cortisol,peak and exposure to light, which the SCN seem to ness, but levels fall when day breaks. It influ- trough in fixed cycles, synchronized to the sense through specialized neurons called ences the body’s ‘master clock’ — the onset of night and day (see diagram, oppo- melanopsin cells in the eye’s retina.These are suprachiasmatic nuclei (SCN) — located in site). Body temperature reaches a maximum sensitive to blue light,but have nothing to do a region of the brain called the hypothala- in the early evening and then falls, generally with vision2. mus. So by taking extra melatonin at the dropping by a full degree centigrade by the Circadian biologists are now beginning desired bedtime, you can retrain your clock end of a night’s sleep. Many other physiolo- to understand what can go wrong with this more quickly to match the local time zone. gical functions show similarly resilient system, and are figuring out how to put it 896 © 2003 Nature Publishing Group NATURE | VOL 425 | 30 OCTOBER 2003 | www.nature.com/nature news feature thing, but coping with the loss of active neu- rons from the SCN, as occurs in Alzheimer’s disease for example6, is more challenging. The internal clock of an Alzheimer’s patient T. SPAGNA/SPL may be out of synch with the actual cycle of day and night by several hours.“Normal old people, and old people with other types of dementia,hit their lowest body temperatures between 3 and 5 a.m.,”says Harper, who has compared the circadian rhythms of patients with different dementias7. “But those with Alzheimer’s frequently occur much later — even as late as noon.” Night nursing So Alzheimer’s sufferers tend to be active when those who are caring for them want to sleep. “In fact, most Alzheimer’s patients go into nursing homes not because of their memory disorders, but because families can’t cope when they wander around at night,”says Eus Van Someren of the Nether- lands Institute of Brain Research in Amster- dam. He is on the verge of completing the Tired and troubled: sleep researchers hope that better knowledge of the body clock’s workings — and first study to follow the progress of of how to influence its rhythm — will help those struggling with drowsy days and never-ending nights. Alzheimer’s patients exposed to different light conditions. right. Studies of the newly identified clock 6 a.m. and ‘owls’ who never retire before Earlier studies8 at the Amsterdam insti- genes are already helping to reveal the causes 1 a.m. will remain as such, whatever the pres- tute showed that exposing elderly rats — of diseases that result in extremely unusual sure from parents, spouses or employers4. suffering from loss of active SCN neurons patterns of sleep and wakefulness (see ‘Seri- As well as being up with the larks, elderly and disturbed sleep patterns — to bright ously out of synch’,overleaf).And experts are people produce less melatonin overall, and light restored both healthier sleep patterns now experimenting with light or melatonin therefore tend to have more disturbed sleep. and the number of active SCN neurons. as a fix for various circadian disruptions.For But a team led by Kazuo Mishima, a sleep “The neurons become inactive but don’t instance, Charles Czeisler, a sleep researcher researcher at the National Center of Neurol- disappear, and at least in the rat they can be at the Brigham and Women’s Hospital in ogy and Psychiatry in Ichikawa, Japan, has reactivated,” says Van Someren. “So we Boston, is testing blue light3 for resetting shown that exposure to bright light in the wondered if this ‘use-it-or-lose-it’ phen- melatonin rhythms. middle of the day can increase night-time omenon could happen also in old and melatonin production and promote deep demented people.” Cycle paths sleep for many old people5. “In general, the In 1999, Van Someren and his colleagues Although everyone’s rhythms operate on a more light old people have,the stronger their began their long-term study of how light daily cycle, our clocks can be set very differ- daily rhythms will be — and so their sleep conditions affect Alzheimer’s patients. It has ently, causing different people to be most patterns improve,”says David Harper, a spe- involved 190 subjects in 12 Dutch residential active and alert at different times of the day. cialist in geriatric psychiatry at the McLean homes installed with light boxes in the In general, we drift towards ‘eveningness’ Hospital in Belmont, Massachusetts. “It is ceilings to mimic skylights. In half of the during adolescence, and towards ‘morning- unfortunate that the old often live in poorly homes these remained bright during the day, ness’ in old age. But our basic personal lit homes and don’t get out much.” whereas in control homes the lighting was preferences are resilient: ‘larks’ who wake at Adapting to normal signs of ageing is one kept low. The researchers measured the strength of the patients’ biological rhythms every six months, and monitored their sleep sleep over a two-week period using an activity Suprachiasmatic Hypothalamus nucleus monitor strapped to the wrist. Van Someren is still analysing the data generated during the first three-and-a-half years of the study, but he reported his early Retina findings to the 1st World Congress of Chronobiology in Sapporo, Japan, in Sep- Daily variation tember. Bright lighting during the day Light shifted circadian rhythms back towards a normal pattern, improving sleep patterns 0 4 8 12 16 20 Pineal and mood. It also seemed to slow the decline gland Time of day (h) in the patients’cognitive capacity. Schizophrenics are similarly often active Optic Melatonin nerve at night. “Psychiatrists have tended to dis- Cortisol miss this observation with the notion that Temperature Signals ‘they can’t hold down a job, so of course to the body they will be staying up all night’,”says Russell NATURE | VOL 425 | 30 OCTOBER 2003 | www.nature.com/nature © 2003 Nature Publishing Group 897 news feature Foster, a circadian biologist at Imperial College, London. Foster and his colleague Katharina Wulff are now trying to find out whether schizophrenics have disrupted cir- cadian rhythms. The eight individuals they have so far studied tended towards extreme eveningness, and the researchers are now K. UNIV. SNIBBE/HARVARD applying to the UK Medical Research Coun- cil’s new Brain Sciences Initiative for funding to study the effect of treating schizophrenics with light. “It will be interesting to see if consolidating sleep–wake profiles helps to control schizophrenic episodes,”says Foster. Light also helps to relieve the symptoms of depression that afflict patients with Out of the blue: doses of light therapy could boost production of hormones that set the body clock. seasonal affective disorder. Also called the ‘winter blues’,the problem is clearly linked to to daylight, particularly in summer, before workers, will be completed by next spring. disrupted circadian rhythms as the nights and after their shifts. Small wonder, then, “Volkswagen is in the vanguard, but other draw in9.
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