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Home > Wellness > Health Library > Nocturnal Hypoglycemia
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 his or her usual
nighttime insulin dose or takes more insulin than prescribed in the
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. 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
Current as of:
November 14, 2014
E. Gregory Thompson, MD - Internal Medicine & Rhonda O'Brien, MS, RD, CDE - Certified Diabetes Educator
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