Scientists in China have discovered that sleeping too much can be just as harmful as not getting enough sleep , as both can affect blood sugar levels and potentially cause high blood pressure . The research showed that about seven hours and 18 minutes of sleep each night is considered the "sweet spot" and may be the optimal amount to lower the risk of insulin resistance, a warning sign of type 2 diabetes . The researchers studied 23,475 adults, aged 20 to 80, from 2009 to 2023 in an