I’m just so tired.

My baby boy has his days and nights mixed up to the point that he is only sleeping like 3 hours though the night. He sleeps though the day but I am unable to sleep though the day while he sleeps. If I lay down to nap I feel guilty like I should be doing things around the house so I do that instead of sleeping. But only getting 3 hours of sleep a night is starting to catch up to me. My mother has offered to keep baby overnight but I feel like it’s to soon to leave him overnight. He is only 4 weeks old and I worry he won’t be comfortable without me. I’ve left him with her though the day for me to do my house shopping and such but never overnight. I’m just worried that if I don’t find away to sleep soon I’m going to have a mental break down due to sleep deprivation. Any tips on finding ways to calm nerves and nap though the day? When did you first let someone keep your baby over night? Does it make me a bad mom for actually considering leaving him over night this early?