Sometimes I've been using files recently and I've suddenly woken up at the end and the whole file has gone by without me even knowing. On a few occasions I've woken up without even being aware of the wakener and waking up to find the file has stopped.
So is this a very deep trance or am I falling asleep? Does it matter? I've seen people on this site who seem to have success with just playing files while they sleep. Has anyone else experienced anything similar, or found that they can just sleep through a playlist and get the full effects?