help me please

Jessica
Ok so i babysit. Im due Jan 5th told her i will quit early December for me time. 
But lately with my 2 1/2 YO and lots of construction on the street and early traffic and noise and this crazy heartburn i havent ben sleeping as well as usual.. the girl comes at 8;15 so i get up 8ish.. but bc i depend on a "LATE NAP" for me to actually get 3-4 hours of sleep i cant fall asleep any earlier than 12-2am at night! My son goes to bed around 11pm which im ok with bc when he sleeps it helps me.. lately though hes ben up at 4-7am wanting "TV" time Juice or snacks.. he is in my bed so i can doze next to him MAYBE sometimes.. then my alarm goes off at 8am for babysitting.. so thats maybe an hour or two after he gets back to sleep. sometimes she is sleeping when she comes so thats considered my late nap!  If not i miss it.  But if so Ill nap with them shell go in my bed with us! But this construction has ben starting at 9 with tractors an big trucks and drill beds .. i just cant win. An lately the heartburn affecting my sleep so I feel like im jusT EXHAUSTED 
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Well the mom is one of my good friends and seems to think im nuts for saying "i really would rather be preparing myself a littlw better than this" after askin what was wrong this morning, seeing my exhaustion she says.
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 "Girl idk how u think u will be prepared. It will get better tho. There is a human forming in u, its exhausting"
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Im waking up due to other things vs whats really going on in my house, ive had one child i know what its like for skipping sleep for feedings an such, but i cant be prepared to do it again going in so drained.. my pregnancy isnt whats draining me. My sons waking episode isnt draining me as much as it sounds bc he goes back to sleep and i can an do with him, its just when my alarms set an i wake up to get her daughter so early, an sometimes she isnt wanting to go back to sleep. 
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Does anyone else understand when i say i can be better prepared? Or am i honestly losing it?!?