Here are some of the common causes for mental fuzziness and what to do about them. Depression Lack of focus and concentration are among the more common symptoms of depression. Major depression can sometimes make it impossible to work or study effectively, and may require medical treatment. Sleep deprivation Disturbed sleep can lead to a lack of focus the following day. Prolonged sleep disturbances may require a doctor’s visit to uncover and treat any underlying cause. Alcohol or drug abuse Dependency on alcohol or recreational drugs may cause the brain to function less than optimally. Even prescribed medication may have this effect, so check with your doctor. Hormonal changes While the effect of pregnancy on the brain is a subject of debate among experts, many women report forgetfulness and focus problems in the later months. Menapause Menopause can likewise cause a temporary disruption to mental acuity, according to a recent study by the University of