Hello As you have cold, most likely the post nasal discharge might be irritating your back of the throat (posterior pharyngeal wall) making you difficult to sleep. * It would be helpful to you if you take antihistamines like Cetrizine one tablet at night. * Take steam inhalation with karval plus vapocaps or Vicks in hot water. This helps as decongestant. * Tablet vitamin C helps to boost immunity. Helpful home remedies: warm milk with turmeric powder/ ginger tea/ sipping warm water with honey. * If fever starts or mucus is yellow green colour or not getting better with this, then you may need to start with antibiotics. * Generally such symptoms are due to viral infection which subside in 5 to 7 days. * Also better to avoid direct cold air blast.