I read somewhere about one method that claims to induce them:
Sleep for 6 hours, get out of bed for 30 mins or until you start to feel sleepy again.
After a few weeks you should be able to have lucid dreams
I haven't tried this, so can't say that it works.
Let me know if you try this!
For those training to be qualified electricians, (myself included), these websites helped me:
Electrical qualifications, courses and exams explained | SparkyFacts.co.uk
These are up to 18th edition :)
Good luck students!