I've been wondering the past days, why I recently for maybe 2-3 weeks ago, started suddenly wake up in middle of night without me trying to do it or using alarm. Not that I think it's bad.. because, it gives me opportunities to practise WBTB without waking up the family (in case they would hear alarm).
I just wonder, how can this sudden happend? It have happend EVERY night the past 2 or 3 weeks. It's usually around 4-5 hours after I gone sleep. But sometimes it's after 2-3 hours (but not very often).
There is no noise that wakes me up what I know of. I use to sleep on 2 places, at my dads home where I actually live, and at my gf's home. If that matters.
I've never before done the CAT technique or any other where I set my sleep pattern to wake up in middle of night.

So, how have it happened? :S just random?
I do hope that I not lose this, that I always wake up in the night, because usually the previous time I woke up in middle of night, I remember dream, or woke right before REM and might possible instead WBTB to LD.