Waking sleep, catnaps, half asleep, resting my eyes, dozing... It's something one is trained to do in the military. Let's the body rest and knocks some of the more jagged edges off of sleep dep/prolongs the time before you go into full on sleep deprivation & psychosis (hallucinations, etc.). Delays the onset of the worst symptoms, but it's not fun. 3-6 weeks without at least a
little real sleep is my own cap before I go completely looney toons. And then I crash hard. 2-3 days flat out. But if I'm sleeping myself out about once a week? Gone months and years this way.
When I'm in waking sleep I can still hear everything, and process it, that's going on around me. Can simply flick open my eyes and stand up / no intermediate period necessary. When I say process? Conversations, people moving around, etc. Have a mental image/map of my immediate surroundings. The more time I have stacked up doing this? The less accurate that map / dreams start intruding on reality.
In fact, when I start acting out my nightmares? I'm usually in this stage of semi-sleep. Like 2 images overlaid on top of each other: my minds eye and the real world. Can't tell what's real & what's not real. Haven't done that in a loooong time, in part because I've gotten used to what that "feels" like, but I've had a lot of problems this year of still dreaming while awake. Months of jacked sleep does that.
@Anarchy... Lucid dreaming is awesome!!! This isn't lucid dreaming, though. Before sleep dep kicks in its like the part of my mind that dreams is pointed towards and keeping tabs on reality while I sleep, and after sleep dep kicks in? There's none of the control. Dreams start taking over reality. So it's almost like the opposite. At least when things get bad. Waking sleep is useful in the short term, since you can be moving at a moments notice, and it's a lot more restful that light-sleep because you can choose to ignore all the myriad things which would otherwise startle you awake... But it's seriously crazy making in the long term.