Most adults need sleeping between seven to nine hours a night to feel and function at their best. But sleeping beyond 9 hours may be a sign of an underlying medical condition. Here are some risks of over-sleeping:-
- Those who sleep between 7 and 9 hours a night have the chance of 27% heritability of depressive symptoms. Those who sleep nine hours and beyond have a 50% heritability.
- Elderly women who sleep too much or too little get their brains' function worsened over a six-year period.
- Sleeping habits can even alter circadian rhythms, hormone secretions and menstrual cycles. There are cases of low pregnancy rates for those women who sleep more than 9 hours.
- People who sleep more than 9 hours a night are twice as likely to develop type 2 diabetes or impaired glucose tolerance over a six-year period than people who slept between seven and eight hours a night, even after controlling for differences in body mass.
- Short or long sleepers gain more weight over the six years.
- Sleeping more than 9 hours lead to the risk of heart problems. Long sleepers have two times the risk of angina and 1.1 times the risk of coronary artery disease.
- Sleeping more than 9 hours also is associated with a 1.3 times greater risk of death.