The current incumbent is regional firm Mere Communications, with which Oldfield will work closely.
The in-house PR construction is part of a drive by the company to raise its profile through targeted and national and regional media campaigns.
Oldfield was marketing manager for Nutrition Point, where she was responsible for introducing dietary products. Before that she was a PRO for Liverpool-based Scientific Hospital Supplies.
She will report to Silentnight marketing head Kate Hardcastle. Oldfield said: 'I will be responsible for internal and external communications and have been given a remit to maximise media opportunities.'