Allergic rhinitis: This is the most likely diagnosis due to the timing of symptoms, which often worsen in the evening or at night, possibly due to increased exposure to allergens like dust mites in the home environment.

Vasomotor rhinitis: This non-allergic condition can cause sinus congestion and is often triggered by environmental factors such as temperature changes, humidity, or strong odors, which might be more pronounced in the evening.
Sinusitis: Both acute and chronic sinusitis can cause congestion that may seem to worsen in the evening due to increased mucus production when lying down.
Environmental irritants: Exposure to pollutants or irritants in the home, such as tobacco smoke or strong chemicals, could exacerbate sinus congestion in the evening.

Tumor or cyst in the nasal passages or sinuses: Although rare, a growth could cause obstructive symptoms that worsen at night due to increased mucus production or positional effects.
Anatomical abnormalities: Deviated septum or nasal polyps could cause chronic congestion that might seem worse in the evening due to increased nasal resistance when lying down.

Eosinophilic esophagitis: This condition, characterized by an eosinophilic infiltration of the esophagus, can sometimes present with symptoms that mimic sinus congestion, especially if there is an association with gastroesophageal reflux disease (GERD) that worsens at night.
Churg-Strauss syndrome: A rare autoimmune condition that can cause sinusitis and asthma-like symptoms, potentially worsening in the evening due to various factors including increased histamine release.