Lack of sleep. Is that a problem?
Think of three things before your Stampede race.
Hydrate with non alcoholic and non caffeinated drinks. Don’t worry if you have to get up to go to the toilet in the middle of the night. Sleep is not critically important the night before.
Eat light. I made the mistake of eating two big meals the night before a marathon once and during the race I stopped at the portaloos more than once for ‘number 2’s’. Just have your normal meal but less.
Go to bed early if you can. Rest rather than sleep is important in the last night. You may be nervous. That is okay as it is normal. It is your body getting ready for your event.