One of the least talked about causes of waking at 3AM has nothing to do with your mind. It is your blood sugar.
What happens when blood sugar drops at night
When you eat a carbohydrate-heavy dinner, your blood sugar rises and then falls over the following hours. For many people it bottoms out somewhere between 2AM and 4AM. When blood sugar drops too low, your body treats it as an emergency. It releases adrenaline and cortisol to bring levels back up. Those hormones are alerting signals. They wake you up.
You may not feel hungry. You may just feel wired, anxious, or unable to get back to sleep. The cause is biochemical, not psychological.
How to tell if this is your problem
- •You fall asleep easily.
- •You wake between 2AM and 4AM feeling alert or slightly anxious.
- •You feel better after eating something small.
- •Your dinner most nights includes bread, pasta, rice, or something sweet.
What to do about it
Eat a lighter dinner with protein and healthy fat. Avoid large carbohydrate portions in the evening. If you are waking hungry, a small protein snack before bed can stabilise blood sugar through the night.
Avoid alcohol in the evening. Alcohol causes a similar blood sugar rebound effect in the early hours.
Related reading
About the author
Charlie Dondous
Charlie Dondous is the author of Stop Waking At 3AM. He writes about sleep science, insomnia, and middle-of-the-night waking. His work focuses on practical fixes rather than supplements or apps.
This is one of six causes addressed in the 21-day plan in Stop Waking At 3AM by Charlie Dondous. The plan works through each cause one at a time with specific daily actions. Available on Amazon.
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