40 percent of adults report that fatigue interferes with their daily activities at least three days a week. To function optimally on a daily basis, healthy adults need about 7-8 hours of sleep a day.
A lack of sleep is linked to a decrease in concentration and an increase in the risk of depression and even impairs sexual function. Persistent fatigue can sometimes be caused by a lack of essential nutrients necessary for optimal energy production, says Grant Antoine, a naturopath and clinical specialist at Viome.