A doctor has revealed the real reason you sometimes 'jerk' in your sleep and are woken up in a jolt of panic.Dr Kunal Sood is an acute and chronic pain doctor from in the US, and often demystifies common medical questions that thousands ask him online.He recently explained that a 'hypnagogic jerk' - also known as a 'sleep start' - is when you suddenly feel like you're plummeting to your death accompanied by a twitching in your legs and arms.
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