All sorts of different studies are pointing to how lack of sleep damages brain cells. One recent study found that in mice 25% of certain brain cells died as a result of a prolonged lack of sleep. Other studies have found lower integrity white matter in the brain, possibly as a result of lack of sleep.
1 Food poisoning; food poisoning can also cause pain in the lower left abdomen. 2  Moreover, it can cause nausea, vomiting or diarrhea and fever. 3  Symptoms usually occur for 24-48 hours. 4  For some cases, need to be hospitalized.
Causes of pain in lower left abdomen include: 1. Diverticular disease - sometimes this can be complicated by the development of acute diverticulitis, abscess and perforation. 2. Hernia - there can be pain in the left groin from an inguinal hernia or femoral hernia(especially if the hernia is strangulated).