What is the fine-grained topic of the following text: Now that I donated my bed's mattress to charity (even though it was barely seven years old, I decided to get rid of as much as I could before the move and treat myself to a new memory foam mattress when I get to Vegas), I've been sleeping on the sleeper sofa in my living room. Only return the topic.
Donating a mattress to charity and sleeping on a sofa