A stroke can strike during sleep with symptoms noticed only after waking

A stroke can strike during sleep, and a person may wake up with slurred speech, weakness or blurred vision.
• Signs include loss of balance, vision trouble, a drooping face, a weak arm or slurred speech, so call for help.
Treatment may still be possible if the start time is unknown, using when the person was last known to be well.
High blood pressure, diabetes, high cholesterol, smoking and sleep apnoea raise the risk, so keep up routine checkups.

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