I couldn't sleep last night either but I know why. I slept mostly all day Sunday because I work overnight and I got into bed at about 9am Sunday morning and slept till about 5pm that night. When I went back to bed at about 9pm, I slept till about 1am this morning and I couldn't fall back asleep so I got up and I have been up ever since. It's now 3:23pm. Hopefully, tonight I'll sleep.