Was sleeping through...?

Laura • Ethan Ashley born 20th September 2015 at 12.08am weighing 8lb 👶🏼
Hi Ladies, For the last 3 weeks Ethans been sleeping through the night by having his usual 9 ounces before bed. He used to sleep 11-12 till 9-10 but this week his started waking up around 6 so I give him his dummy he'll suck on it I'll lie back down and his dropped it and just crys again I've had to move his bed closer to me then at some point I give up and put him in bed with me so I'm up early then I don't want him into the routine of sleeping in my bed constantly. I've had my window slightly open as my partner gets hot so I thought maybe his cold so I put him in a sleeping bag and swaddle him and tuck a blanket over him but that's not working :( please help