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Nocturnal hypoglycemia refers to low blood sugar levels at night in a person who has diabetes. Blood sugar levels can drop below their target range at night if a person eats too little food after taking the usual nighttime insulin dose or takes more insulin than prescribed in the evening.
Low blood sugar can also happen when:
But sometimes the reason is not obvious. Nocturnal hypoglycemia may also be related to previous exercise or increased physical activity.
Signs of low blood sugar at night include:
Testing blood sugar levels at about 2 a.m. to 3 a.m. for a few consecutive nights may help a person find out whether low blood sugar is causing the symptoms. Continuous glucose monitoring (CGM) devices can also help. Some of these devices sound an alarm when blood sugar is too high or too low.
Nocturnal hypoglycemia may be prevented by decreasing the evening insulin dose or by adding more food to the bedtime snack.
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