Nocturnal hypoglycemia: understanding and preventing the risks

Nocturnal hypoglycemia is one of the most feared by people with diabetes. Occurring during sleep, it can go unnoticed or be detected too late, sometimes with serious consequences. Understanding its causes and knowing how to prevent it is essential for a good night's sleep.

What is nocturnal hypoglycemia?

Nocturnal hypoglycemia is defined as a drop in blood glucose levels below 0.70 g/L (3.9 mmol/L) during the night .

• It most often occurs between 2am and 4am , when the action of insulin reaches its peak.
• It can remain silent (not perceived by the person) or cause symptoms (sweating, nightmares, waking up with a start).

What are the risks associated with nocturnal hypoglycemia?

• Disturbed sleep : sweats, nightmares, fatigue the next day.
• Risk of confusion upon waking or inappropriate behavior (eating without checking blood sugar).
• Severe hypoglycemia : loss of consciousness if not corrected.
• Rebound hypoglycemia (Somogyi effect) : blood sugar drops, then the body reacts with hyperglycemia in the morning.

What are the main causes?

• Evening insulin too high (incorrect dosage or type of insulin).
• Insufficient evening meal or one rich in fast-acting sugars (peak followed by a drop).
• Late-night physical activity without appropriate sugar intake.
• Alcohol consumed in the evening blocks the release of glucose by the liver.

How to prevent nocturnal hypoglycemia?

• Check your blood sugar before going to bed : correct if necessary with a small intake of carbohydrates.
• Adjust insulin doses with the help of your diabetologist.
• Plan a suitable snack in the evening (complex carbohydrates + proteins to prevent falls).
• Check after late-night exercise and provide additional sugar if necessary.
• Limit alcohol in the evening or always accompany it with food.
• Keep a source of glucose readily available (stick, juice, sugar) on the bedside table.

Knowing how to perform effective sugaring is essential to avoid complications.

> effective sugaring

Why glucose gel is particularly useful at night

• Ready to use : no need to look for water or food.
• Immediate action : directly assimilated, ideal in case of waking up in hypoglycemia.
• Convenient size : fits easily on the bedside table.
• Usable even in semi-sleep : simple, quick, effective.

Having a glucose stick on hand is an essential safety measure to quickly correct a nocturnal hypoglycemic episode.

Key points to remember

• Nocturnal hypos can be silent or severe.
• The main causes: evening insulin, insufficient meal, late exercise, alcohol.
• Prevention involves blood glucose control before bedtime, an appropriate snack, and adjusting doses.
• Having a rapid glucose solution at the bedside is essential for reacting without delay.

Practical tip: Record your blood glucose levels in the evening and morning. If you regularly experience nighttime hypos, adjust your treatment with your medical team.