Sleep Cycle by Thomas Cross

It's been a half a year since your commander woke you from hypersleep. Your ship is on a 50 year trip out to the newest colony. You're the second-to-last "pilot": your commander will stay awake for the last year of the voyage. You've monitored the ship, monitored the rest of the crew, and you've tried to stay busy. It's a big ship, but there's only so much time you can spend exercising and reading. Finally, it's time to go back to sleep again.