Can you be more specific?
Answer:
Ask your parents when they are in a good mood.
Ask to have the sleepover at a convenient time.
Be polite instead of demanding.
Keep the first sleepover simple.
Offer to do something kind in exchange.
Show them that it will be a good opportunity for you to socialize
A 5 year old because they have the ability to speak probably a full sentence. All you have to do is figure out what their trying to say