Nothing - on solo trips I sleep with the sun, rise with the sun..
Sociable trips there is the chat at the fire.
On multi week trips there are often maps/itineraries to check.
No need for anything else...
I usually mend the fire, make coffee, eat and write in my journal.
The dark lasts long here at this time of year and I usually sleep a long time.
I have never had a book (other than the almanac) with me on a woods trek, and certainly not one of those modern, electronic gadgets you speak about .
I'll take whatever book I'm reading and a reference type book and an mp3 player. Sometimes I've had some critter (an owl once was a nightmare) that keeps making a keep me awake type noise and I have to get sleep or I get migraines the mp3 player with some tunes helps me sleep. If I'm not trying to sleep though the music of the woods is fine by me
I like reading and I'll often pick up something to read locally to where I'm, staying - e.g. I picked up a copy of Coyote Stories by Mourning Dove in a New Age/hippy store in Joshua Tree before I headed into the National Park last year. There's nothing like reading something with a local flavour while chilling out in your hammock before you fall asleep.