There is a long list of things that can cause this kind of night sweating. Diabetes, hormones, thyroid problem, malignancies, etc. More history including other symptoms could really be helpful. Also if you are male or female.
That is still not much of a history, so it is hard to narrow the cause. You are showing hypothyroid symptoms so this is a possibility. Although there a number of causes of hypothyroidism so again it could be hard to narrow down the possible cause without more information.
One thing you can do to help reduce the sweating is sage leaf, which is an antihidrotic. If you take the powder straight or use it as a tea it will also function as a bitter.