Socks. 2 layers. 3 even. A pair of thin socks under a pair of thick is best, much warmer than just the thick ones. If the thin layer gets sweaty, change them for a new pair. Sweaty socks will make you cold. Put fresh ones on before bed.
Layer the rest of your clothes. Layering traps heat between.
You can tack or tape blankets (like those cheap fleece ones) over windows or sliding glass doors.
Tips:
Wear a hat, even to bed.
Socks. 2 layers. 3 even. A pair of thin socks under a pair of thick is best, much warmer than just the thick ones. If the thin layer gets sweaty, change them for a new pair. Sweaty socks will make you cold. Put fresh ones on before bed.
Layer the rest of your clothes. Layering traps heat between.
You can tack or tape blankets (like those cheap fleece ones) over windows or sliding glass doors.