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.
And in women, the left fallopian tube and ovary. In addition to causing pain in the upper left abdomen, a few causes (bowel cancer, enlargement of the abdominal aorta, food poisoning, infection or kidney stones, trapped gases, etc.) may be the cause of pain in the left lower abdomen.