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Considering your limited space, I'd recommend a sofa with a good mattress. It serves a dual purpose, providing seating during the day and a comfortable sleeping space at night. Now, onto the importance of light in interior design – it plays a crucial role in creating ambiance. Ensure your space has both natural and artificial lighting for a well-balanced feel. Also, consider Egyptian cotton duvet cover sets for a touch of luxury. The soft and cozy fabric enhances the sleeping atmosphere. Personally, I recently purchased royal blue duvet covers from Cutesy Home, and they've added a perfect blend of comfort and style to my sleeping space.