As now a days cold
is increasing day by day.The problem you are facing found in such environment very commonly.This is called kaphaj avarodh according to ayurveda.The patient suffers at night most because,the srotorodha increases at night naturally.
1)drink warm water at least before going to bed.
2)shwasa kuthar rasa,shankha bhasma,praval panchamrut rasa are very effective.
3)application of kombadnakhi+suntha+varshabhu in paste form on nostrils and sinus
area gives very immediate result.
Also the pathogenesis should be rectified first i.e. H/o jaundice
,U T I, worms etc. According to this the aforesaid treatment may differ.For this you should refer to an ayurvedic expert vaidya to rectify and treat the symptom / disease immediately.