| http://www.w3.org/ns/prov#value | - it is then that the brain starts the breathing process again.'Although you might not fully wake up, your brain will wake each time there is a blockage, and that causes terrible tiredness during the day,' explains Adrian Williams, professor of sleep medicine at King's College London.The long-term effect of obstructive sleep apnoea if not treated is frightening - it is linked to high blood pressure, t
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