Are you drinking caffeine/eating too much sugar in the afternoon. That can definitely disrupt your sleeping patterns. Also, if you're stressed out about something its tough to completely relax and fall into a deep sleep. You might try going home and journalling, writing out everything you're concerned about and then coming up with ways to solve/attack those problems. If you try modifying your diet and de-stressing and that still doesn't work check with your doctor..its always good to be on the cautious side if you're concerned about something. Take care..and hope you're able to figure this out!