1. Cataplexy is triggered by stress and strong emotion such as laughter, anger, or surprise.

2. Dr Allen, 35, a scientist, suffers from bouts of "cataplexy", a rare symptom of narcolepsy, triggered by strong emotions-such as fear, surprise or laughter.

3. Methods 30 narcolepsy subjects with cataplexy who had no direct or specific treatment since 6 months were admitted to the department for fluoxetine treatment efficacy studies.

4. According to the Daily Telegraph, Dr Allen, 35, a scientist, suffers from bouts of "cataplexy", a rare symptom of narcolepsy, triggered by strong emotions-such as fear, surprise or laughter.

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5. The symptoms of narcolepsy—particularly sleep attacks and cataplexy—can wreak havoc on your ability to live a normal life.

6. Like most cataplexy sufferers, Ms Underwood is also battling narcolepsy - a condition that makes her drop off to sleep without warning.

7. Cataplexy can be reduced by antidepressant drugs, which suppress rapid eye movement sleep.

8. There are two main classes of antidepressant used for treating cataplexy - the Tricyclic antidepressants and the Selective Serotonin Reuptake Inhibitors.

9. Two of the most common narcolepsy symptoms (excessive daytime sleepiness and cataplexy ) seem to be connected to emotional state.

10. Narcolepsy affects around 30, 000 people in the UK and about 70 per cent of them also have cataplexy.

11. Three cases were admitted to hospital for excessive daytime sleepiness while another 3 for cataplexy.