Is there a meditation course for better sleep?

Yes. Sleep and rest is one of the goal areas a course can be built around, and it suits a course better than a one-off session because winding down is a habit rather than a single event. Body scan and long, slow breathing are the techniques most often used, and a course gives you enough sessions to make them familiar enough to work when you are tired. In StillMind a Goal-based course for sleep runs 5, 8 or 12 sessions depending on the length you choose, and each session is written fresh around the goal you described.