It's because you're not used to going to bed that early, just keep going to bed the time you have been and eventually your body will get used to it.
I would know, since I'm the master of completely reversing my sleeping pattern, I was literally nocturnal all winter lolol, stayed up till 10 in the morning sometimes latest, then went to sleep and would wake up around 6pm and do it all over I don't recommend it :s
Even though my body was used to it I still felt like crap every time I got up.
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