7W 5D and all I wanna do is sleep!!

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Is anyone else going through this?? Is it normal to be THIS tired?? I seriously wake up at about 7am, have breakfast and by 8:30-9 I'm dying for a nap or to simply lay down. I feel guilty because I think I should be more active, I'm scared that my "laziness" will affect me in a negative way in the long run. Any thoughts? Is it normal? Should I fight my fatigue and stay up?