My eldest was always an early riser too, he went to bed at 6pm and was up at 5.50am, I swear that boy had an internal alarm clock

When he was in a big boy bed (around 13 months) it was a lot easier, he just came and hopped into bed with me and would snuggle and use me as a road with his toy car

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When he was too little to do that I just got up, picked him up and bought him to my bed so I could 'sleep' until 7am.
The other 'cure' is "Wait til he hits puberty" then you will have trouble getting him to get up this side of noon
