I don't know much about the sleep cycle, and my reply might be useless, but here are some things that come to mind.
It seems you get a lot of sleep given that you got 10-11 hours per night on winter break. The 8-hour norm is only an average. It's different for different people (I think females tend to need a bit more, older people need less.) It seems you need an hour or 2 more sleep than most people, although I suppose it depends on how you were feeling during the day while getting 10-11 hours of sleep. If you meant to wake up earlier and usually felt bad the next day, maybe you do only need 8 hours.
As I'm pretty sure you know since you mentioned the 90 min time period, REM periods occur approximately every 90 minutes after sleeping, but the exact time also differs among different people. So waking up in multiples of 90 mins after falling asleep will probably help you remember your dreams. I don't know whether it's healthy to wake up every 90 mins though. You're probably better off doing it during the later periods, staring at maybe 4.5 hours or so, since REM periods are longer later on in the cycle and you'll have more to remember.
I don't think you specifically mentioned a dream journal. If you haven't started one of those, you probably should. I don't know whether actually writing down your dreams improves recall more than going over them in your mind, but it might. I don't know, and this is just speculation, but I suspect taking the time to write down your dreams - actually devoting time during the day to dreaming - will make your subconscious aware that your dreams are important to you and you'll be more likely to LD and have vivid dreams.
Thinking about dreaming during the day might help with recall and lucid dreaming ability. Maybe since starting school, you've been busy and haven't devoted as much time to thinking about your dreams.
If you aren't already, devoting time in the morning to remembering dreams is a good idea. It's advised that you don't move from the position you're in when you wake up. Sometimes, it at first seems like you haven't remembered any of your dreams. All you have are a few vague images, maybe an idea of an emotion you were feeling or a person involved or a place you were in, but nothing substantial. It's advised, and I find it works well, to concentrate on even the small fragments. Usually when I do this, I get flashes of memories which quickly fade, but for a moment I remembered something else about the dream. After a couple minutes of being frustrated, almost grasping what the dream was about but not quite there, continuing to think about the small fragments I do remember, some major scene in the dream will usually come to me. From there, other scenes which followed from or led up to the one I remember come back to me. It's a good idea, when you remember a scene, to ask how you got there, what happened before the scene to cause it.
Sorry this got so long. I don't doubt you've heard a lot of this before, maybe all of it, but I don't mind. The time I've spent writing about dreaming and LDing will hopefully increase my chances of having one tonight.
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