question about fatigue

day 5 of flu a and i’m slowly starting to feel some relief! during the first 1-4 days i pretty much didn’t sleep at all. maybe 6 hrs over the span of 4 days. now that im feeling a bit better, i slept for 14 hours!!!!!! i still feel that i could have slept the rest of the day away. has this happened to anyone else? is it a side effect of the flu? of the steroids or antibiotics i’m on? or just my body trying to fight this off? hope everyone else will heal soon 💜