Sleep help

I am the one to get up with the kiddos always as my husband works long hours and leaves the house at 3 am anyways. Between sleep deprivation and the heat lately I have been feeling sickly exhausted.

My 2 year old is getting molars and I have a 2 month old. I'm one exhausted mom. What do you guys do to get through the day.

I am on just normal vitamins and do 1 cup of coffee and 1 can of pop a day. Also the kiddos for what ever reason are never napping at the same time no matter how hard I try. I have resorted to letting the baby nap on me with me sitting up in the middle of my king size bed as I am desperate.