Lumintop Tool AA 2.0
This little light has been wonderful for me for over three years. It's always in my pocket. I have taken it on multiple thru hikes now. Clips onto my hat very securely. I wear it as a cycle commuting head light. It's just perfect. And affordable!
I recommend sleeping in a dark room. I've spent most of my life working nights and blocking out my windows is a necessity.
If you can sleep with ear plugs in that can help block out all the noise the day walkers make. I personally find them too annoying but other people have found success.