Lucid dreams are cool... I miss them; I haven't had one in years but I used to have them quite a lot, because they often coincide with broken/erratic sleep patterns. The reason I haven't had them since is because my sleep is better and I was/am too lazy/impatient to learn how to do them on demand 
... ie the general tips for that are 1) to keep a journal of your dreams so that you can identify 'dreamsigns', 2) practice in waking life - so that it becomes a habit that you hopefully will continue doing when you're dreaming - checking whether you're dreaming or not, for instance by counting the fingers on your hand... because numbers behave strangely in dreams, and 3) the most reliable method even for the lazy is to set an alarm to interrupt your sleep after about four hours, so that it hopefully coincides with a period of REM sleep, then when you go back to sleep you're much more likely to have a lucid dream.
... ie the general tips for that are 1) to keep a journal of your dreams so that you can identify 'dreamsigns', 2) practice in waking life - so that it becomes a habit that you hopefully will continue doing when you're dreaming - checking whether you're dreaming or not, for instance by counting the fingers on your hand... because numbers behave strangely in dreams, and 3) the most reliable method even for the lazy is to set an alarm to interrupt your sleep after about four hours, so that it hopefully coincides with a period of REM sleep, then when you go back to sleep you're much more likely to have a lucid dream.
