B12 and Sleep
High vitamin B12 levels can potentially cause or worsen insomnia by affecting the body's natural sleep-wake cycle and melatonin production, which regulates sleep. Research shows a correlation between elevated B12 and increased insomnia risk, especially in individuals with type 2 diabetes. Taking B12 supplements late in the day can also disrupt sleep by increasing alertness and disrupting the circadian rhythm. How B12 can affect sleep: Circadian Rhythm Disruption: B12, particularly methylcobalamin, has been shown to increase the light sensitivity of the circadian clock, which can advance the body's sleep-wake cycle and lead to insomnia. Melatonin Production: Increased vitamin B12 levels can decrease melatonin production, a key hormone for sleep, which further contributes to sleep difficulties. Increased Alertness: Taking B12 supplements too close to bedtime can increase alertness and interfere with the body's natural sleep-wake cycle. Considerations for high...