My rem cycle usually starts at around five am, and if i get woken between five and six, i'm usually right in the middle of a dream and therefore can recall it much easier than one i might have had earlier in the night. I also find that if i wake up at this time, stay up for an hour to two hours and then go back to sleep, i find i have some really clear and vivid dreams. This morning i was actually aware that i was dreaming, but decided not to go lucid as i was too fascinated by how the dream was unfolding!!
I shall definitely be trying it tomorrow! Maybe wake myself up, read Laberge's book for a bit, and then go back to sleep...