So TIRED!!!!

I am about 7 weeks and I cannot function! I have to take my kid to school at 7:30, but when I come back, all I want to do is sleep or lay down. I am so unproductive it's sad. The days I do work (I'm a massage therapist & esthetician) I am yawning all day and I get home and plop myself on the couch and that's it. No cleaning, no nothing. Just dinner. This is the total opposite of what I am. And it's messing with my head... how do I get over this laziness?!