Millions of Americans wake between 2 and 4 AM every night with a racing heart and an alert mind. The medical system reaches for sleep aids. The actual problem is metabolic, and it responds to food. You go to bed at 10:30 PM and fall asleep quickly. Hours later sometime between 2 and 4 AM, you snap awake. Your heart’s racing. Your brain is on high alert. Your body is, for some reason, primed for action. Sometimes it’s a hot flash, or sweating, or a nightmare… or even an inexplicable sense of anxiety with no thought attached to it. You lie there for an hour, locked in a staring contest with your ceiling, trying to fall back asleep. Around 4:30 or 5, you finally drift off… Just for the alarm to go off at 6:30. Now you’re wiped out and have a long day ahead. If this describes any percentage of your week, it’s not experiencing anxiety, insomnia in the psychiatric sense, or stress you can't identify. There’s a good chance it's metabolic. Yet the medical system often prescribes a sleep aid, a benzodiazepine, or trazodone. None of those address the underlying issue, but do make you wake up groggier. The 3 AM wake-up is one of the most misdiagnosed conditions in modern American medicine. And the fix is almost entirely about what you eat and when. Before we discuss the fix, here is what is actually happening. Blood glucose normally sits between 70 and 140 milligrams per deciliter during the day, dropping toward the lower end of that range during overnight fasting. Somewhere between 3 and 6 hours after your last meal, glucose can dip below approximately 70 mg/dL. When it does, your body activates an emergency response called the counter-regulatory hormone cascade. The pancreas reduces insulin output, while glucagon signals the liver to convert stored glycogen into glucose. Furthermore, the adrenal glands release adrenaline (epinephrine) and cortisol. Adrenaline mobilizes stored energy quickly. Cortisol does the same job more slowly and stimulates gluconeogenesis, the liver's process of making new glucose.