I usually just sleep on my pack but I bought a LuminAID as an impulse buy when I ordered my backpack. It's pretty neat. It's a waterproof inflatable solar light that doubles as a pillow. At 3oz that's not bad for a multi-use item. I've only used it twice but slept fine both times. Good luck finding what you're looking for!
http://www.luminaid.com/product/luminaid-solar-light/