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How much sleep do I need?
Can lack of sleep harm me?
I feel exhausted all the time. Do I have insomnia?
What can trigger insomnia?
What about other sleep problems?
How can I improve my sleep?
If self-help fails, what else can I do?
Useful organisations
"I know I swept the trauma of my divorce to one side. Now, I find that the slightest bit of stress, whether it's professional or personal, sets off my insomnia. I feel that psychotherapy is helping a lot, although I still have a long way to go. I think that once I've addressed my past unhappiness and got it out of my system then, I hope, I'll be able to sleep again."
This booklet looks at the nature of sleep, the causes of insomnia and other sleep problems, and describes the self-help approaches and professional help available.
Usually, about seven or eight hours a night is enough for the average adult, but a small number of people need more than ten hours or fewer than five. At least one sleep expert believes we could all get by on six hours of 'core sleep', with the emphasis being on quality rather than quantity.
The amount of sleep we need, and its pattern, changes with age. Small babies sleep for around 17 hours each day, in several short bursts. Young children need a nap during the day to make a total of nine or ten hours. In healthy adults, between 19 and 30 years old, seven or eight hours sleep a night is usually enough. After the age of 50, this average falls to six hours, or less. Older people often revert to sleeping for several shorter stretches.
Sleep passes through several cycles of deep and light sleep each night. At the end of each cycle, a different kind of sleep takes over, known as REM (rapid eye movement), when we dream. This happens roughly every 90 minutes. Dreaming is even more important for our wellbeing than deep sleep, which is thought to be especially restorative for the brain.
During deep sleep, more growth hormone is released than at any other time of day. When extra hormone is needed (during adolescence and in pregnancy, for instance, or following exercise), or when we're short of sleep, we take more deep sleep, and stay asleep for longer. Older people spend more time in light sleep.
Losing a night's sleep once in a while won't cause lasting damage. During stressful times, when starting a new job or sitting exams, people can go for several nights with as little as two or three hours a night. Once the pressure is off, most of them return to their normal sleeping pattern. But some people develop more lasting problems, which can lead to fatigue during the day, and cause irritability and difficulty concentrating. This can be dangerous, especially when people are driving, operating machinery or doing other skilled tasks.
It has been suggested that poor sleepers might develop more problems with their general health than good sleepers. But, studies that have looked at the negative effects of sleep deprivation have only noted psychological changes, which can be reversed when the sleep loss is made up.
When people frequently go without sleep, or have many broken nights, they incur a 'sleep debt', which eventually has to be paid off. Sleep debt can affect intelligence and control of movement, and can have a bad effect on the metabolism and on hormones.
While people are in the sleep-debt state, they are more likely to make mistakes or act irrationally. Sometimes, lack of sleep contributes significantly to the development of serious mental health problems.
If you're feeling tired, irritable and having problems concentrating, you may automatically put it down to not getting enough sleep. But, studies have shown that people who believe that they have long-term insomnia may actually be getting only 40 minutes less sleep per night than other people. It’s easy to overestimate the length of time you spend lying awake at night.
Sometimes, people who have been taking sleeping difficulties in their stride are confronted with additional stress. This can make them suddenly focus their attention on their sleeping pattern, so they come to believe, mistakenly, that all their problems stem from insomnia. But tiredness and a sense of fatigue can have other causes, like stress, depression or certain health problems.
Many people experience difficulties in sleeping. If you have a couple of disturbed nights, for whatever reason, it can make you more anxious about getting to sleep, or about whether you are having enough sleep. This worrying can make your sleeping problem worse.
There may be practical reasons behind your insomnia. You may have difficulty getting to sleep because the conditions are unsuitable – it may be too hot or too cold, too noisy or too light. Or there may have been a sudden change in your circumstances, such as moving into a new home or staying in a hotel, for example.
If that change is a spell in hospital, you may be feeling very anxious, too. Being in pain, of course, will inevitably inhibit sleep. Any illness can temporarily change your sleeping habits. There are also a number of illnesses that may directly cause insomnia, including an under-active thyroid and post-viral fatigue syndrome (myalgic encephalomyelitis, or ME).
Certain prescription drugs can disturb sleep, and if you take a diuretic, for example, you may need to get up in the night to go to the toilet. If you are taking prescription drugs and having problems sleeping, it's worth asking your GP or pharmacist about it. Sometimes, sleeping becomes a problem when you stop taking certain medicines, such as antidepressants, or minor tranquillisers. (See Further reading.)
Jet lag or shift-work can disrupt the internal body clock that tells you when to sleep and when to get up. If you have been awake all night, it may be difficult to get a good sleep, starting in the morning, because your body temperature, adrenaline levels and general alertness are all increasing. Shift workers sometimes have to come off night work because of long-term fatigue.
Alcohol, nicotine and caffeine are all powerful drugs, which alter sleep. One cigarette may have a calming effect that promotes sleep, but as you smoke more, nicotine levels rise and act as a stimulant. On average, a smoker sleeps 30 minutes less every night than a non-smoker. Alcohol is also a sedative and makes people sleep, but when the amount of alcohol in the system drops, it can have the opposite effect, causing insomnia later on in the night. Long-term drinking can ruin natural sleeping patterns. More than five cups of coffee, per day, is also likely to make it difficult to get to sleep and to stay asleep.
Although older people tend to sleep less, it can be easy to ignore the contribution of social factors, such as loneliness, poor living conditions, depression, or the effects of living in an institution, such as a nursing home or hospital. Insomnia can often be the result of not getting enough exercise, too, because people get less opportunity for physical activity as they get older.
Sleeping problems are often connected to underlying emotional problems that are causing anxiety or depression. Somebody who is habitually very anxious, may become afraid of falling asleep, because they fear they might die in their sleep. A depressed person, on the other hand, is more likely to wake in the early hours of the morning feeling panic-stricken or full of dread.
Any traumatic experience is likely to bring disturbed nights in its wake. Stressful events such as unemployment, bereavement or divorce frequently trigger bouts of insomnia.
You may have nightmares if you are stressed, anxious or depressed, or if you are withdrawing from drugs, such as minor tranquillisers or antidepressants. They are also common following a traumatic event.
These occur during deep sleep, and may be caused by stress, or when normal sleep patterns have been broken (when doing shift work, for instance).
Night terrors can accompany sleepwalking, or may occur on their own. During these brief episodes, the dreamer may scream and seem very frightened, although they are not fully awake. Both sleepwalking and night terrors are more common in children, who often grow out of them. Take any necessary precautions, such as having stair gates and locking doors and windows.
During the dreaming (REM) phase of sleep, limb muscles are limp and paralysed. If something suddenly disturbs you during this phase of sleep, your mind may wake up before your body does, and so, for a few seconds, you become aware of your inability to move and may be unnerved by it. Usually, such episodes are very brief, ending when you become fully awake.
People sometimes have hallucinations as they are falling asleep or while they are waking up. The hallucinations are usually very brief and simple, and the person quickly becomes fully awake and aware. They aren't a sign that anything is wrong, but may occur, for example, when looking after a wakeful baby, or when sleep is similarly disrupted.
Extreme daytime sleepiness may be caused by narcolepsy. Those who are affected fall asleep frequently, throughout the day, and experience vivid images and voices as they are dropping off. While this is happening, they may twitch, their eyes may jerk and their muscles lose power. They may also have hallucinations, which may last longer or be more elaborate than the brief hallucinations mentioned above. Sleep paralysis is also more common and longer lasting.
People with this condition tend to snore very loudly and to stop breathing, for very short periods, during the night. They wake, briefly, when this happens, and so may become tired the following day. The condition is more common among the overweight, and with increasing age (see Useful organisations).
The key to feeling refreshed is having a regular pattern, not how many hours of sleep you get. If you go to bed before you're really tired, and then sleep badly, you'll tend to stay in bed later in the morning, which will affect the next night's sleep, and so on. The following steps can help you establish a good pattern.
If you are stretched to the limit during the day, doing a stressful job and taking on too many responsibilities, you are unlikely to sleep well. Insomnia can be a symptom of other, more general difficulties, and you may need to improve your assertiveness, time-management and decision-making skills.
If you haven't yet done so, it may be a good idea to see your GP, so that any physical problems can be eliminated. It may be appropriate to have a blood test to check your thyroid function. If you feel that depression, or any other emotional problems, may be causing your difficulties, or if you are suffering from nightmares, you could consider talking to a counsellor or psychotherapist. Your GP may be able to refer you.
You could also go to see a clinical psychologist who works with people experiencing sleep problems. They may use cognitive behaviour therapy to help you. (See Making sense of cognitive behaviour therapy (CBT))
Treatment may involve keeping a sleep diary, recording information, such as, the time it takes you to get to sleep, any anxious or repetitive thoughts, the number of times you wake up and for how long, and the number of anxiety dreams you are having. The emphasis is on changing old habits.
These can help if you're experiencing acute stress, caused by a crisis or a bereavement. They are sometimes prescribed to try and break a bad sleep habit. But sleeping pills should not be prescribed for more than a few days, because they may be addictive. Their effectiveness decreases, over time, and people may experience 'rebound' insomnia when they stop taking them. Newer sleeping pills are said to cause less dependency, but such claims should be treated with caution. (See Making sense of sleeping pills and minor tranquillisers)
There are particular concerns about sleeping pills being prescribed for older people, since they tend to remain in the system for longer. Cognitive therapy may be just as effective, and the benefits last longer.
These are used to assess insomnia and other sleep problems, such as narcolepsy or apnoea, and involve spending several nights in the sleep laboratory, wired up to a polygraph machine that monitors your sleep. (It may be possible to use one in your own home.) As a result, people sometimes come to realise that they sleep far longer than they thought. Being observed and taken seriously may be therapeutic in itself, even if there is no magic cure at the end of it.
Battle Against Tranquillisers (BAT)
PO Box 658, Bristol BS99 1XP
tel. 0117 966 3629 or 0117 965 3463
web: www.bataid.org
Helps people withdraw from benzodiazepine tranquillisers and sleeping pills.
British Snoring and Sleep Apnoea Association
tel: 01737 245 638 fax: 01737 248 744
web: www.britishsnoring.co.uk
Information and advice
Council for Information on Tranquillisers and Antidepressants (CITA)
helpline: 0151 932 0102
web: www.citawithdrawal.org.uk
Information and advice service for people addicted to tranquillisers
Narcolepsy Association UK (UKAN)
tel. 0845 450 0394 web: www.narcolepsy.org.uk
Charity offering information and advice about narcolepsy
Sleep Matters Insomnia Helpline
tel. 020 8994 9874 (6pm to 8pm)
Insomnia helpline supported by the mattress industry
Sleep Unit
St Thomas’ Hospital, Westminster Bridge Road, London, SE1 7EH
Tel: 020 7188 1800
Sleep clinic requiring a doctor’s referral.
Thyromind
www.thyromind.info
Encourages people to have their thyroid checked as a possible cause of health problems, including insomnia.
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This booklet was written by Janet Gorman and revised by Mind
First published by Mind 1989. Revised edition © Mind 2008
ISBN 978-1874690-68-9
No reproduction without permission