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It's normal not to sleep through the night while heavily pregnant. But it's not normal to continue working while pregnant expecially with 2 other kids.
I'm a big believer in the importance of health over wealth so maybe you need to take a look at your finances and see if you can save $ rather than working.
A granny nappy, so you don't have to get up to wee.
Just take each day as it comes, try and do an afternoon or evening of baking and prepare meals for freezer so you don't have to worry about dinner every night.
Stuff the housework your more important :-)
Put the plastic sheets on the bed amd sleep through it. Benedryl is safe during pregnancy and should knock you out for a good sleep
Start maternity leave early if that's an option you don't want to burn out entirely before bubby is here. Or reduce your days or hours?