I'm one of those people who almost ALWAYS have to have their head outside of the mummy-bag hood when I sleep. It's not the bag, I just never get all that comfortable with my head restricted. Due to this I have been experimenting with different caps on my last few trips to keep my head warm in 35-45 degree evenings.
I've tried the generic knit wool cap --- so bulky, not a fan. Last trip I used a smartwool cap (merino wool with fleece headband inside), and I woke up with my head so hot I thought I was on fire. So I am definitely looking for something a bit lighter/less warm then this.
Any cheap recommendations? I usually don't start my camp season until the end of March so weather is rarely below 35f.