I've seen this thread on how to get deeper sleep here, but I'd like to know how to get lighter sleep. At the moment, after falling asleep I'm pretty much a rock that cannot be awoken until either my body feels like it, or there's some sort of war going on outside. I've also heard that lighter sleep increases the chance of lucidity, as you're closer to consciousness.
I try to go to bed earlier to get more sleep, but don't end up falling asleep until hours later and I can't often lie in in the morning.

Any ideas?