Nose bleeding can also be seen due to hereditary, dry nose, lower vit k levels, some foreign body, superficial veins, rhinitis secondary to
deviated septum (seems to be relevant) etc. Sometime veins are superficial and any minor harm to nose causes bleeding.
When nose start bleeding you need to sit rather than sleep, as sleeping causes increase in pressure inside head and cause more bleeding also pinch the lower smooth area of nose to prevent more blood loss. Take care and regards.