When I was in sixth grade I got a semi-rare disease called rheumatic fever. It attacked my heart, joints, and brain. As the disease progressed, I lost control over my fine motor functions, the left side of my body was basically unresponsive, the right side of my body was mostly beyond my control, I couldn't walk, write, or speak clearly, and if I had gone another few weeks undiagnosed my the damage to my heart would have been severe enough to require replacement of several valves if not my whole heart. It took quite some time for me to fully recover. Since I was sick I've had chronic sleep-onset insomnia, though it's possible that it was unrelated to the disease itself.