Not Much Sleep

So recently I've been getting into bed at around 9-10 and reading, watching YouTube videos, surfing the Internet etc. for about an hour before turning off the lights at around half 10-11 ish hoping to get some much needed sleep. By this time I'm usually quite tired so I put my head to the pillow and wrap my duvet and pillows around me, trying to get comfortable. Half an hour later I'm yawning and I'm still trying to get to sleep. After I realise that I'm not falling asleep I plug in my headphones and start listening to my iPod, hoping some soft, sleepy music will help soothe me to sleep. It doesn't. I lay there for a while longer before looking at my clock, anywhere between one to two hours has passed before I give in, read for an hour and can then finally sleep. 

What's wrong with me? :(