Believe in God; believe that he is, and that he created all things, both in heaven and in earth; believe that he has all wisdom, and all power, both in heaven and in earth; believe that man doth not comprehend all the things which the Lord can comprehend.
*Let it go. Whatever it is you are worrying about. Here is one of my favorite scriptures about that:
Therefore, let your hearts be comforted concerning Zion; for all flesh is in mine hands; be still and know that I am God. (see also Psalm 46:10)
*Let go of worry about not getting enough sleep. Once in awhile insomnia is no big deal. Is it habitual? Talk to your doctor about it. It may be a sign of a bigger problem.
*Avoid naps, don't sleep in and get exercise or physical activity during the day.
*Lay off chocolate for awhile. Tough one, I know.
*Watch Mormon Messages or Bible Videos. When we are touched by the Spirit, peace and sleep may come easier. That is, unless God is trying to get your attention. Then go and see what the Lord has to say. Answer like Samuel as recorded in the Old Testament,
"Speak, Lord; for thy servant heareth." Samuel 3:1-19
Then sleep, because God needs you to get up and get to work :-)