Hey, Derek here!
Tonight I got home from the gym and I just wasn't tired. I felt fatigued, but I just didn't have that desire to go to sleep that normally comes around 9:30pm or 10:00pm. Not only that, I felt as though my mind just wasn't settled.
Now, sleep is a complicated thing... There are many things that can contribute to difficulty falling asleep, but in this case I quickly identified the cause - the thermostat.