I wake up at night and start shaking?

This could possibly be sleep paralysis, it's like when part of your brain starts to wake up but your body's still sleeping.

This happens to me a lot and I really wish it didn't.

It's like being awake but your dreaming.

Some people have it worse than others.

Sometimes people see scary things and feel as if they can't breath right or it gets really cold

Last night I had it and I woke up not knowing what happens but my heart was beating really fast, I felt so scared and cold.

Or you could have low blood sugar.

If u are dieting, ask a doctor.

Or if you are exercising a lot, consult a health professional.

If this continues for more than a week, get checked out

Low Blood Sugar? How long ago did you eat? You should get it checked, just in case. It can happen in the middle of the night. Or your blood pressure could have gone up..too much sodium? Too much caffeine? All cause shaking.

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Tell a dr. about all this; it sounds serious.