All the most effective stuff you can do to get better sleep is done ahead of time (like daily exercise, not spending time in bed when not sleeping, keeping a sleep schedule, avoiding caffeine/alcohol etc), so if I get to that point there isn't that much to be done. Getting up and doing something nonstimulating other than lying in bed for ten minutes can help a little bit sometimes. If there's something in my sleep environment that is abnormal and it's possible to correct it that will help. Lowering the temperature can help.