It’s just dawned on me that my 9 & 7 year old go to bed quite early 
7pm for the 7 year old with lights out at 7.15 and 7.30 for the 9 year old with 1/2 hour before lights outs. They both read in bed before going to sleep.
Both are really good sleepers so 7 year old will sleep till 6.30/7am and my 9 year old will sleep to 7/7.30am
Is this too early should I be switching it up and making it later?