The good news is that most activities to help with LD don't take up much time. Reality checks now and then throughout the day take no time - do them while you're in line or waiting for your next class. A dream journal takes just a few minutes to write out in the morning. If you do find yourself with spare time, read up on Lucid dreaming on the internet or get one of the many books on the topic. Just thinking about Lucid Dreaming gives you a chance to have a LD.