What does sweating while you sleep mean ?

Could be many things: sweating at night could be as simple as getting hot at night, but night sweats can also be a symptoms of other health problems- infections, autoimmune problems, thyroid problems or cancers More serious causes of night sweats often are accompanied by other symptoms - fever, fatigue, weight loss or not feeling well -- if you have any other symptoms/no other explanation for night sweats -see doctor

Night sweats: it can be a sign of infection ,malignancy, menopause, hormonal imbalance, neurological conditions etc. sometimes it is idiopathic