Nightmares Spike Blood Sugar, Experts Warn

Nightmares can significantly impact blood sugar regulation, a connection that often surprises individuals. During disturbing dreams, the brain perceives danger, activating the body's stress response. This leads to the release of adrenaline and cortisol, hormones that increase glucose levels. Adrenaline prompts the liver to quickly release stored glucose, while cortisol encourages additional glucose production and temporarily reduces insulin sensitivity.

For individuals using continuous glucose monitors (CGMs), these overnight fluctuations are more readily detectable. Those with diabetes or prediabetes may experience more pronounced spikes and a slower return to normal levels due to existing challenges with glucose management. Frequent nighttime glucose surges, particularly when coupled with disrupted sleep, can negatively affect fasting glucose and morning blood sugar readings, potentially contributing to the dawn phenomenon.

While a single glucose spike after an unsettling dream is typically not concerning, persistent or unexplained overnight spikes, especially when accompanied by poor sleep, should be evaluated. Factors such as sleep apnea, chronic stress, or late-night screen use can influence these patterns. Consulting a doctor or sleep specialist is recommended if these issues continue, to identify and address any underlying sleep disorders or unmanaged stress.