One thing I use which sleeps warmer than most anything else is a long-sleeved silk shirt and pants, found at the thrift store for a couple of dollars. I wear these over my fleece tights and thermal top. This keeps me warm on cold nights backpacking. The most valuable thing I took recently on a backpacking trip in the far north was a long piece of soft fleece, such as you would buy at a fabric store. I use this inside my sleeping bag, and it is great! For some reason, it is softer than most fleece blankets sold in the stores. I also wear thick cheap wool socks from Wally World, and a fleece hat.
One last thing I use backpacking, is a long piece of Insul-Fleece, bought by the yard at Walmart for ~ $3 a yard. I put this on top of my mattress, and it really does warm. Oh, and as previously posted, don't forget a fleece or other insulated cap. If the temps drop down in the 30's and 40's, you should be fine like this.