What Happens If You Sleep Too Much?
Sleeping more than nine hours a night may seem harmless, but research suggests it can pose serious health risks. While most advice focuses on the dangers of too little sleep, oversleeping has also been linked to physical and mental health problems. Experts warn that consistently long sleep durations could signal underlying issues or worsen existing conditions.
Excessive sleep has been associated with a range of health complications. Studies indicate it can weaken the immune system, leaving individuals more vulnerable to illness. High blood pressure, diabetes, and an increased risk of stroke have also been observed in those who regularly sleep beyond the recommended seven to nine hours for adults.
Mental health can suffer as well. Oversleeping may lower serotonin levels, raising the likelihood of depression, anxiety, and even severe symptoms like psychosis or hallucinations. Some individuals report heightened aggression or difficulty concentrating during the day after prolonged sleep. The causes of excessive sleep vary. Underlying sleep disorders, chronic medical conditions, or untreated mental health struggles—such as depression—can all contribute. Despite this, general sleep guidelines often emphasise the risks of sleep deprivation rather than oversleeping, leaving many unaware of the potential dangers.
People who sleep more than nine hours nightly face a higher chance of being overweight and developing long-term health issues. While individual sleep needs differ, consistently exceeding recommended durations may require medical attention. Recognising the risks of oversleeping could help prevent complications before they arise.
