Why waking up between 2am and 3am could actually mean something serious

Dr. Berg’s experience

In a recent YouTube video, Dr. Berg explained that cortisol—the body’s primary stress hormone—should normally be at its lowest point between 2 a.m. and 3 a.m. However, for some people, cortisol actually spikes during this period, disrupting sleep and negatively affecting daily functioning.

He also pointed out that magnesium helps regulate cortisol levels, suggesting that sleep problems linked to early-morning waking may be connected to a deficiency. He advises anyone struggling with persistent sleep issues to consult their GP.

Describing himself as an “insomnia expert,” Dr. Berg revealed he battled severe sleep problems for over ten years. In his video, he asked viewers:
“How do you fall back asleep if you wake up between 2 and 3 a.m.? I dealt with this for more than a decade, and it was destroying my life.”

He added that the issue went far beyond brief awakenings. Some nights, he didn’t sleep at all, lying awake until morning. “It felt like torture,” he said.