his body could well be programmed to waken at that time
BUT DONT LET THAT STOP YOU
my smallest two at ages 3 and 5 were also like that
I bought a gro vlcok, made ahuge thing about it
read the cute little books that comes with it for the first few nights
made up a little 'bit' that we always (still even now at 4 and 6) say when we say goodnight to the sun
and it worked like a dream
UNTIL gecko, yes the three year old, worked out how to 'make' the sun come up as soon as she had woken
HUMPH
but sod that I thought
she would run in shotuing, 'sun is up mummy'
I would roll over, see it was too early (first morning I thought I had mis set it or something...second morning,, I realised and she admitted that she was tampering with it) and put her back to bed, she would cry, I would ignore, she learnt
she realised I knew when the sun was supposed to get up (obviously I explained calmly) and that messing with it got her nowhere
now they seem to have adjusted (I only ask for 7am) and if they do wake before the sun is up they know not to come into me (and also that its not downstairs time)
they g o to the loo and return to bed with some toys or books
sometimes they are a bit loud (not overly) but that is what the pillow you aren't using is for to put over your ears 