I have done winter nights for a lot of years, since the 1990's!
Sleeping bags alone have gotten a whole lot better.
I have been at the lake when the lake froze over that night, on more than one occasion.
I used to have a 'summer bag', which would go inside my 'winter bag'. Did I care the winter bag was red?πππ
They kept me warm when it got cold.
Then I switched to a minus 12 Polar bag by Coleman.
Again very warm at night, when it was freezing over outside. In the morning I stayed by the lake until I had cooked my breakfast then drove home after freeing my lines.
I have made the point before that as anglers we are 'conned' by 4 season, or 5 season when in reality we could do with knowing how low you can go. A minus 12 bag will allow you to survive at minus 12, it does not mean you will be warm.
A 5 season bag is not always intended for the UK market as rarely does it get into constant month long temperatures well below freezing.
Then we reduce a bags effectiveness by diving in fully clothed, complete with jacket and overtrousers, reducing the insulation effects of the sleeping bag, then we get up fully clothed and can't get warm.
Sounds counter intuitive, but take off your jacket and fleece and sleep in single layer clothing you will feel warmer, and especially when you get up and put them on for the day.
Also diving into the sleeping bag wet does not do you any favours!