First let me give some background before answering to your question.

 Your swelling – excess fluid outside the vascular system –  is the result of a process that starts before you can see swelling or feel any swelling with your fingers.

In a normal body, the production of fluid and the amount of fluid moving into the space outside the vascular system is balanced by removal of fluid from this space into the vascular system. The lymphatic system plays a crucial role in removal of the fluid from outside the vascular space to back inside.

When there is too much fluid for transport, or the lymphatic system is impaired and overwhelmed by the normal amount of fluid, then decompensation occurs.

Stockings provide compression and help both sides of the problem. By keeping the swelling away, you allow the lymphatic system, even if impaired, to do its' job to the best of its ability.

I would suggest you wear your stockings every day. If you are wearing the stockings everyday and still have swelling, I would see a lymphedema therapist who can assist in treatment recommendations for nighttime.  Typically stockings are not for night time wear.