Answer: Pearl should avoid studying in her bedroom at all. A desk with a well-cushioned, ergonomic swivel chair in another room would be perfect for her needs, since she would get all the comfort without the excessive relax that a bed or even a sofa would offer. If she insisted on using a sofa, though, it would be advisable to add one of those special sofa-tables where she could place her notes and rest her arms, since this makes the "sofa experience" feel closer to an academic activity and is likely to enhance her focus.