No one really seemed to answer your real question, so I'll give it a shot. Everyone moves or jerks in their sleep so if you have your eyes closed, your dropcam wouldn't know if you were asleep or awake. IF you are asleep or dozing, these jerks are called periodic limb movements (PLMs). Do you remember occassionally jerking and coming awake suddenly? As I said these are normal, and sometimes you just come awake for a second and then are right back to sleep, sometimes it just brings you up to the lightest sleep level and then you go back down. So even though you say you are clearly awake or moving around on the dropcam, you might not really be awake. (of course I may be misinterpreting how your dropcam is working). The only way you would know is if you are awake enough to write down the time. If you can't do that, you can't count yourself as really awake.
Whether this is a problem or not or affects your sleep amount depends on how often these PLMs happen. Some people have them a couple times a night, others are aflicted all night long with 100's of them. It would take the full wireup of a medical sleep study to know because they are also measuring your brain waves. The PLMs are one of the things they report.
As far as waking at 3 am, that's a common side effect of many sleep medications and even other medications (like ropinorole). If you go back to sleep, probably no problem. I'd ask your doctor about your other medication side effects (if you are taking any other). Your need for sleep can drop as you get older, so it may be that 6 hrs of actual sleep is enough for you. If you aren't sleepy during the day or dropping off while driving, then I wouldn't worry too much about it. Your body is adjusting to what you need.
Like many others responding, I think you are very lucky. My average is 3 hrs of sleep, I have a high number of PLMs, plus RLS so I often don't fall sleep until 3 am, before that I'm just laying there trying to not move my legs and after going to sleep I'm jerking around. Last night I got 1 hr 5 min. Because of the PLMs I always show a couple of hundred steps in the morning. I check this by charging my flex at night sometimes, then it shows no steps in the am. If I set it to sleep mode while charging, it shows a wonderful night sleep because it didn't move! I know this isn't enough sleep for me because I'm always getting drowzy during the day and feeling like I want to curl up underneath my office desk for a nap. I have to be careful in the morning to get enough coffee or I'm having those blank moments for a sec or two (called micro-sleep) while driving to work.
Aside from the personal comments, I hope this helps give you some insights as to why you aren't getting the sleep efficiency for what you want. If you are really worried, then go to a sleep doc and get a sleep test.
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