As clocks turn back an hour early Sunday, many look forward to extra sleep — but Dr. Sudha Tallavajhula, UTHealth Houston professor and medical director of the TIRR Memorial Hermann Neurological Sleep Medicine Center, says the time change can still disrupt the body’s natural rhythm and more than just your mood.
“Our bodies are wired for a roughly 24.2-hour circadian rhythm, which means we’re naturally inclined to fall asleep a little later each day,” Tallavajhula says. “Even a one-hour shift can make it harder for some people to wake up and feel alert, especially those who already struggle with sleep.”
The adjustment can lead to what’s known as sleep inertia — the groggy, disoriented feeling before the brain is fully alert. The effects can include increased irritability, difficulty concentrating, and even safety risks such as more workplace errors or drowsy driving.
“Sleep isn’t optional — it’s a biological need,” she said. “When we don’t prioritize quality sleep, the cognitive and emotional impacts are nearly immediate.”
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