4 weeks no energy 😩

This is my second child and I have nooo energy.’ My husband works from morning to evening and then I work evening to 10pm. My two year old is currently playing and watching some tv but every time I dose off he wakes me up. I’m trying to stay up but I’m so drained! How can I get some energy back? My husband is abt to have a 1 month military drill and it’ll be me and my two year old all day. Idk how I’m gonna manage. We have no help