Hi! My DS is 16 months has always been in sleeping bags for nighttime since he was tiny but recently he’s started wriggling out and I actually watched him on the monitor pulling the buttons on the top whether for comfort or actually trying to set himself free is debatable! We seem to have tried every clothing combination there is in desperation to see whether he’s too cold/hot and a vest, pj top and 2.5 tog seems the best but only whilst he’s in it!! For the last few nights we’ve had to go in either the middle of the night or really early morning to put him back in as he’s woken up cold. Someone told me about a sleeping bag with arms - I’ve researched them and one was £70 so that’s a no go! ! I’ve ordered some fleece sleep suits in desperation from NEXT but I don’t whether that’s a good option either - do I just pop a vest on and that’s it? He definitely won’t keep a blanket on either 
I always get the impression he doesn’t like being too warm so I’m worrying now that the fleece thing will be too much! The room temp is a constant 19c. Literally at my wits end! He’s only just started sleeping through in the last few weeks and now another thing to contend with! Any advice much appreciated! Xx