My cousin passed away recently and he was extremely sick. He was 15 but wasn't able to walk, talk or communicate and his bones broke very easily. His brain didn't function to the point where he could understand what's right or wrong but there were two things he always smiled at; his mom and watching cartoons. Before his passing, he was laying in bed and he kept smiling and looking up, he couldn't sleep and kept on smiling for a while.
My aunt never saw him smile like that and as happy as she was, she was also a little worried. She did think maybe he was going away slowly. After hearing those things and witnessing them, it makes me feel like something might have been calling him. Sounds ridiculous I know but my cousin didn't smile much. It was almost as if he was happy where he was going and he knew what was going on during that moment.