Sleep Deprivation

Mommies, how do you promote a long night sleep of your babies? Earlier today i experienced dizziness , i think it's primarily due to sleep deprivation. Long before I have my child, I already have difficulty in sleeping. I gave birth last March 2 and I didn't have a decent sleep since then. Having a sleep for 1-2 hours at night is a routine now for me, 3 hours if lucky. Advice please...