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Such episodes are seen usually in cardiac disorders which is called as syncope
. These syncopal attacks can be called as fainting spells
too. This also happens when there is sudden fall in blood pressure or sugar levels in the body. I suggest assessment of blood pressure and sugar levels also. Take a nutritious diet and drink lots of water. At least 3-4 liters per day of water is normal recommended intake. Get your sugar levels tested with your BP. Keep pillows below your feet (foot end elevation)during sleep to increase the blood to heart and brain. Thanks.