Sure, your kid needs to get complete sleep before the event. You would never want to see them sleepy during their birthday, as they may act up and spoil not just their day but their guests too.
They may not find sleeping easy because of excitement, but nevertheless, encourage them to sleep early. Put them to bed early, turn off the lights, read them stories or anything else that can make them feel sleepy.
It is their day, and as their parent or guardian, it is your responsibility to make their party the most memorable. Their birthday does not happen every day, hence it is only necessary that you make it the happiest. Collaborate with party planners to ensure you can achieve exactly what you want for your kid’s birthday.