tjdale said: I use a fleece “sleeping bag” from Wally World that works great.  About $12.  Light.  Packs small.

Yes ~ That’s the way to go!

http://www.kmart.com/shc/s/p_10151_10104_089B464198110001P?prdNo=1&blockNo=1&blockType=G1

K-Mart, Meijers, Wall Mart;  $9 to $12  Lightweight, compact, warm, cozy.
For spring/fall rides, I use it as a sleeping bag liner.  ( I haven’t seen it in pink though.)

Blanket and sheet?  I’ve tried that, and always ended-up tangled in them.
(I move a lot when I’m sleeping.)  I get a great night’s sleep in a lightweight
bag, and put on sweat’s if it get’s cooler.