JOHN BAVOSI / SCIENCE PHOTO LIBRARY JOHN BAVOSI / SCIENCE PHOTO LIBRARY
Insomnia or dreaming. Abstract illustration of a human brain depicting insomnia or otherwise the process of dreaming. An open eye is superimposed on a starry night sky, within an image of the brain. Insomnia is the inability to sleep or an inability to sleep for an adequate length of time. The condition is characterised by perpetual tiredness and often irritability; one in three adults may suffer from insomnia at some time in their lives. Alternately, dreaming is the occurrence of ideas, emotions and sensations, during sleep. Highly visual experiences may be "seen" and "enacted" in a dream, although many dreams may not be recalled upon awakening.
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