Hi, another 'not AIBU'. I have recently acquired a fitbit type fitness watch, and it's absolutely brilliant, it's helping me lose weight and is all round wonderful. However, I was wondering how accurate the sleep tracker function on them is? I ask as I have been suffering with fatigue for months (could be years) and have never found a reason for it. I wore my watch to bed for the first time last night and after syncing it this morning it has revealed that of the 7hrs 53mins sleep I got last night, only 43 minutes of that was deep sleep, and 2hrs of light sleep, the rest was something called wakeful sleep 
What does this mean? And is there anything I can do to change it if it turns out to be an every night thing??