B.M.
yeah they are getting enough sleep but just going to bed too early. It will take a few weeks for them to adjust but if you moved their bedtimes to 7:30 or 8. They will sleep in better. My kids go to bed at 8 and wake around 7 or 7:30. Remember it won't be an overnight change. They will probably be cranky for a few days because they will go to bed later and probably still wake at 5 or 6. So be ready for that! LOL but after a week or so they will adjust.