Why am i so tired

Kris🐶🐶👶🏼
My baby is 2 months old andshe's pretty   much sleeping thru the night. She falls asleep about 9 and wakes up between 3-5am. I go to bed about 9-9:30. I dont wake up until she does. 
   We go back to sleep after she gets fed between 3-5 until about 7:30am. I sleep like a rock once i fall asleep. So i just cant understand why im so exhausted. Its hard to get up in the morning at 7:30. 
Once she starts squirming around in her bassinet (which is the first signs shes hubgry) i hear her but i just cant get up. I fall back asleep a few times until she eventually starts crying. I dont have a prob getting up the first time, i think thats bc j know k can go back to sleep. 
this is really scary bc i go back to work in a few weeks 😖 and i get up at 4 for work. 
Any suggestions or reasonings why im so exhausted?

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