My six year old daughter is very restless in her sleep n wakes up tired every morning even though she gets 10 hrs of sleep?

Needs an evaluation: Any kid who sleeps that long but remains tired/moody likely has a treatable sleep problem. It suggests she is unable to enter the deep sleep pattern that is most restorative. This could be from obstruction (big tonsils/adenoids) or another problem but only a good evaluation could sort this out. Start with her ped & consider an ENT or sleep doc for further study.