I'll see an interesting educational video on YouTube but i'll wait until I'm eating to play it or else I'll have a feeling of wasting my time.
Or in class if I have my computer in front on me i'll go check stuff on my server or do some web searches even if I really like the topic of the class.
I don't know if I'm missing motivation or discipline or both. I really enjoy talking and reading about the aformentioned topics, but I can't devote 100% of my attention to lectures/videos, or maybe only in 15-30 mins incréments.