Good morning!!

For about two days now, my head has been throbbing, making it impossible to focus on studying. I've also been incredibly sleepy, but even sleeping didn't help, so I was wondering what to do... But when I woke up today, I felt so refreshed..! I went to bed at 3 AM, and usually, my head would hurt even more, not get better..? But as soon as I woke up today, it felt like I had slept for a solid 12 hours. I woke up at 9 AM, so that's only about 6 hours of sleep, right..? My usual sleep time is around 5.5 to 6 hours, so I slept my usual amount, but I really didn't expect all that accumulated fatigue to be washed away in just 6 hours..!