A surprisingly common condition in which you stop breathing for 10 seconds or more as you sleep. The lack of oxygen causes your brain to wake you up, or pull you into much lighter sleep. Either way, it can have a profound effect on the quality of your sleep - and that of any bedfellow, as it's often accompanied by loud snoring. A terrifying experience, where the body, which naturally becomes paralysed during REM sleep, is still paralysed when you wake. You are fully conscious but cannot move or speak, sometimes for several minutes. Some people also feel as if they are choking or their chest is being crushed and they may have visual hallucinations. The condition can be exacerbated by sleep deprivation, some drugs, and disorders such as sleep apnoea.
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