Sleep problems are really, really common with bipolar disorder! Probably most patients have to deal with this.
Here is some information:
http://www.webmd.com/bipolar-disorder/guide/bipolar-disorder-and-sleep-problems
And you can google something like "sleep and bipolar disorder" for even more help.
One of the primary, most important, goals of treatment is giving patients *regular,* restful sleep.
Can you talk with your doc about this?