<p>Uberman is hard to do without a really really flexible and independent schedule (e.g. you work/take classes from home on the computer). There hasn’t been a ton of research on it, so who knows what negative long-term effects there are from not getting REM sleep?</p>
<p>Plus, I’ve heard of people on Uberman having strange cravings after they start the program. One guy (might have been Steve Pavlina in the links above) said he wanted grape juice all the time.</p>
<p>The point is to train your body to enter REM sleep immediately. However, you skip other sleep cycles, the importance of which are not entirely known.</p>
<p>From everything I’ve read, the uberman sleep cycle will leave you feeling rested mentally, but you need to be lying down for a certain amount of time (much more than a few hours) to allow your muscles to repair and your spine to decompress. It’s doable for a certain amount of time, but after a while you will start to feel the effects. Again, this is just what I’ve read. I was considering trying the uberman (or everyman) sleep cycle, but I decided against it, so I have no first hand experience.</p>