How do I combat waking up anxious?

The majority of the time, I wake up with an anxious feeling. A few minutes before I wake up, I have very brief dreams that are very realistic about real life problems or things I have to do, e.g. I forgot to do homework, I have to get somewhere at a specific time, an uncomfortable conversation. But dreams or not, I still wake up anxious. Any advice on how to combat this? Thanks.