I’m 5 weeks and 5 days today, I have been so exhausted this week alls I want to do is sleep but I don’t actually sleep if that makes sense.?

I’m starting a new job on Monday and it’s for a cleaning company and I’m scared I’m going to too exhausted at the end of the day to be a mom to my 2 boys and a wife to my husband. I don’t remember being this exhausted with my other 2.