Stress, fatigue and too much caffeine may trigger sleep starts, experts say.
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Sleep starts: Why your body 'hiccups' as you fall asleep
Ever drift off to sleep and suddenly feel like you're falling, forcing you to wake with a start? Some people say they are startled alert by a loud snapping noise or a blinding light coming from inside their head, while others describe their muscles twitching involuntarily from a sudden electric shock.
