Why can’t I sleep before important events?

Tomorrow I host an important ceremony in a Grand Theatre and I have to travel from one city to another, I prepared lots of things, spent lots of money for everything to be great for this day and I can’t seem to sleep.

I will have to stand for hours on high heels whole day, and I can’t seem to force myself to sleep. I hate to imagine, I’ll look sleepless and tired tomorrow.

I will probably only get 3 hours sleep. I never have problems falling asleep. Why can’t I sleep before important events?

Updates
9 mo
I wish I could sleep earlier and had gone there well rested.
Why can’t I sleep before important events?
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