14C room what to wear under 2.5 tog sleep snuggler

[Lily7050]

My 6 month old LO got infection, was coughing yesterday and had a slight fever. I gave him Calpol before taking to bed. He was wearing a long sleeved bodysuit, a sleepsuit and 2.5 tog sleep snuggler (from JoJo Maman bebe).
When he woke around midnight I checked his temperature and it was below 35C.
I was petrified. I then checked the bedroom temperature and found out it dropped from 17C to 14C. Heating in the bedroom is off. The house is over 30 years old and not well insulated. I guess because outdoor temperature was close to 1C, the room temperature dropped so much. It took me couple of hours hugging and covering him with my duvet to get his temperature to over 36 degrees. In the end we co-slept for a few hours.
Today around 7pm the bedroom temperature was already close to 15C. It will probably drop further. So I decided to add 2 extra layers under the sleep snuggler: wooly onesie and cotton jumper and trousers. Now I am not sure maybe wooly onesie is too much?
How do people decide how many layers to add?

In the same position so following with interest. Have just ordered a 3.5 tog bag with sleeves. Does your sleeping bag have sleeves?

gro.co.uk/what-to-wear/

I use this as a guide of what to put my DS in

My LO does not like sleeping bag or blankets as he likes kicking even when he is asleep. That's why I got sleep snugglers from JoJo Maman Bebe which are basically warm sleep suits. Unfortunately they do no do 3.5 tog. I am about to order an oil filled radiator in attempt to make the room warmer.

get a plug in oil heater for the room they are brilliant.

Interested to see any other responses to this as we put LO (4 months) to bed last night in long sleeve vest, sleepsuit and 1 tog love to dream swaddle under a 2.5 tog sleeping bag. She woke at 2 and was not feeling particularly warm on back of the neck. Room temp had dropped to around 14.2 deg so I added a single layer cellular blanket tucked under the mattress over her bottom half and she settled back down nicely after her feed.

I'm super paranoid about overheating but if I followed guidelines for when room is 16 - 18 degrees of long sleeve vest, sleepsuit and 2.5 tog bag she wakes up cold and her hands in particular are like ice blocks.

Following as I'm stuck with what to put my LO in to bed as he is cold when waking up in the night for a feed. I end up sticking him in bed with me :(

Gro do babygrows with padded sleeves, we had a room that we struggled to get above 15° so would use a long sleeved vest, a gro babygrow and a 3.5 tog sleeping bag.

We use an oil filled radiator in the nursery for that reason. Big old house, would cost a fortune to keep it all above 16 degrees! Works really well for us.

Oil filled radiator worked fin in the big bedroom. On Monday our LO was moved to a cot in a smaller room. It used to be a "storage room" and still got quite a few carton boxes, old mattresses etc.
I set up the oil radiator at lower level but my LO was coughing a lot, waking up almost every hour and could not eat much because of coughing. I am not sure whether it was the oil radiator or dust on all stuff. Has anyone had some sort of allergic reaction to oil radiators?
I am going to put him to the cot with radiator switched off, use 2-3 fleece blankets as the temperature drops to 14 degrees still and see if he coughs less during the night.