If counting sheep doesn't work..... Here are some tips to help you reach dreamland:
Avoid caffeine, nicotine and alcohol for 4 to 6 hours
before bedtime.
The first two are stimulants and while alcohol may have a
sedative
effect at first, it tends to disturb sleep after several
hours.
Perform relaxing rituals before bed, such as taking a warm bath, listening to relaxing music or eating a light snack. 
Before going to bed, try to put your worries out of your
mind and plan to address them at another time.
Make sure your bed in comfortable and the bedroom is
conducive to restful sleep. 
Wake up at the same time every day, even on weekends, to
normalize the
sleep-wake schedule.
Don't take naps, or if you must, nap during the
mid-afternoon for no
more than 20 minutes.
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Don't exercise within 4 to 6 hours of bedtime. Working out earlier in the day not only doesn't hinder sleep, it can actually improve it. 
Reserve your bed for sleeping. To preserve the association between bed
and slumber, don't watch TV or do work in bed. 
Go to bed only when sleepy. If you can't fall asleep within 15 to 20
minutes, get out of bed and read a book or do another
relaxing activity for awhile rather than trying harder to fall asleep.