I haven't yet had a formal sleep study done, but purchased a zeo alarm clock (http://www.myzeo.com/sleep/shop/) and have been using it long enough now to have a solid picture of what my typical sleep patterns are like, and which days I feel slightly better after sleep. I've noticed the light sleep intruding on deep sleep periods that people always point to as typical for us. I've also noticed that I wake up many times each night even on the nights I think I've slept through. A number of awakenings, just for very short periods of time (less than five minutes). Often these come straight out of a section of deep sleep, which I found odd. More often I awake from deep sleep than any other stage, by a wide margin. Anybody have insights of why I always wake up at the end of a deep sleep cycle? I don't snore, and to my knowledge don't have any issues with sleep apnea or anything. Seems like there must be some kind of significance to the deep sleep wakings, though. And I really don't cycle normally. It's supposed to go deep, light, REM in cycles, which longer periods of deep sleep at the beginning of the night, then longer periods of REM towards the end. But the overall length of the cycle should be pretty consistent, repeated over and over. I have a couple sections of deep sleep early on (but no REM), then huge uninterrupted plateaus of REM sleep later in the night. Extremely little mixing. Much more REM sleep than any normal average, too, and all together with no deep sleep at all in there. Deep and light early on, REM and light later. My husband has worn it a couple of times to compare, and I couldn't believe how much his sleep cycled back and forth compared to mine. What's more, the longer those REM sections are, the better I feel in the morning. The times I feel close to partly rested are the nights that I've had more than three hours of REM, in long periods, without interruption. Maybe it's just because it's helpful for me to be paralyzed for that many hours of the night, but I suspect something more to it than that. Not sure if most sleep studies last the full night or not, so if others have info about whether they get those huge REM slabs later on in the night, but I'd be curious to know if that's a common trait, or something particular to me. Does anyone else have a zeo? Or did your formal sleep study results show anything similar to what I'm describing?