Ds sucking in his sleep

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Ds been asleep about two and a half hours. Is in crib next to me. 'dream' feed just wakes him up so am going to go to sleep in min and just see when he sleeps until. However he's audibly sucking in his sleep. Does this mean he's hungry, or just dreaming of milk?

I think all babies suck in their sleep. He'll fuss or cry and wake up if he's hungry.
Sweet dreams....

Ds has done it since birth. He only does it when he's in a deep sleep. It's so cute .