Excessive night sweats, with no apparent cause, can have several causes. If the night sweats arise in isolation, without associated signs and symptoms, should not be a cause for concern since probably not a health problem.
However, if perspiration is intense to the point of soak the pajamas accompanied by other symptoms such as fever, weight loss, tiredness, cough, shortness of breath, chest pain, diarrhea, itching, enlarged lymph glands or any other change, night sweats may be caused by more serious situations, such as:
- Infections;
- Lymphomas and other cancers;
- Little blood sugar (hypoglycemia);
- Use of medications;
- Sleep apnea;
- Hormonal changes.
Other possible causes (not serious or less serious) for the excessive night sweats are:
- Menstrual period;
- Menopause;
- Consumption of alcoholic beverages or use of drugs;
- Hyperhidrosis (a condition that causes excessive sweating);
- Room temperature high;
- Use pajamas or very warm blankets during the winter, even on colder nights.
In your specific case, since you have already done several tests and nothing has been found, it is alcoholic beverage is at the origin of your night sweats, even because you have already noticed that you tend to perspire more during the night when you drink.
Even so, if night sweats continue, see a endocrinologist or one homeopath, even if no other symptoms appear.