Struggling with Sleep Issues and Attendance in College

I've been having these awful sleep issues that have been seriously impacting my ability to attend classes this semester. It doesn't really seem like a pattern, so the cause is really hard to pin down. Some days I just can't sleep to save my life, and some days I will sleep the entire day and still not feel rested. My sleep schedule has been super inconsistent. Recently it has gotten to the point where almost every other day I'm missing class because of my sleep problems. I've had depression-related sleep problems before, but never anything like this. I can't get in to see a sleep specialist for months. Does anyone have a similar experience? Any advice or ideas? I really can't afford to drop classes at this point. :/