Unable to fall asleep during a fever despite extreme tiredness

What the title says. Yesterday at around 5pm, I took some NyQuil because I was sneezing alot and had runny/stuffed nose. (Turns out i had a fever.) I took it again around 10pm when I went to sleep but I was unable to sleep at all during the whole night. Literally the whole night I was just laying in bed unable to fall asleep. I may have gotten and hour or two of sleep but that’s all. I got out of bed around 8am because there was no point in just laying in bed doing nothing. Then today at 2pm I tried to take a nap and only got an hour of sleep. Now it’s currently 5:30pm, extremely exhausted, and I’ve been laying in bed since around 3pm unable to fall asleep again. I really have no idea what’s going on I appreciate any sort of insight. Thanks