Unable to Sleep

Sleeping is probably one of my biggest issues, my depression and overthinking causes me to lay awake at night, stare at the ceiling and feel numb. I take Melatonin 2mg every night, it's useless. I either sleep too much or not at all.  I don't think I've felt well rested in weeks. I dream of jumping in front of trains, how sad is it? Dreaming of suicide. Anyways I feel that it's not going to change for quite some time, I need to increase my sleeping pills or change them, it's not fair laying awake every single night, either feeling nothing or feeling too much. My life has no balance whatsoever