As a person with a long history of intermittent insomnia, I had this bad feeling last night that I'd not be able to go to sleep no matter what.

So, I did what I normally do in those situations, which is probably not the right thing, by the way. I stayed up and tried to distract myself until I forgot about that thought. It usually eventually works, but last night, I couldn't seem to forget the thought, and at about 4:30 am, I was so tired that I thought I should be able to fall asleep, regardless.

And I did fall asleep, but I think it was around 6. In retrospect, I should have just taken some medicine at midnight.