Night sweats refer to episodes of heavy sweating that occur during sleep and are not caused by an overly warm sleeping environment. While it is normal to sweat during sleep if the bedroom is too hot or if there are too many blankets, true night sweats involve drenching perspiration that soaks clothing and bedding despite a comfortable room temperature. Night sweats can be a significant source of sleep disruption and may be a sign of an underlying medical condition. Night sweats have many potential causes. Hormonal changes are among the most common — they are a hallmark symptom of menopause in women and can also occur in men with low testosterone. Infections such as tuberculosis, HIV, and other conditions involving fever can cause night sweats. Certain medications, particularly antidepressants, can trigger them as a side effect. Medical conditions such as hypoglycemia, hyperthyroidism, lymphoma, and other cancers are also associated with night sweats. Lifestyle factors can contribute as well. Consuming alcohol or spicy foods in the evening, sleeping in a warm room, or exercising vigorously close to bedtime can all increase perspiration during sleep. If night sweats are frequent, severe, or accompanied by other symptoms such as fever, unexplained weight loss, or persistent fatigue, it is important to consult a doctor to rule out an underlying medical cause. To manage mild night sweats, practical strategies include keeping the bedroom cool, using breathable natural bedding materials such as cotton or linen, wearing lightweight moisture-wicking sleepwear, and avoiding alcohol and spicy foods in the evening. Staying well hydrated is also important.