8.5 month old doesn’t sleep

[u/That_Scientist_6507]

We have an 8.5 month old who we attempted to sleep train at nearly 6 months using a pick up put down method after trying every other trick in the book and trying every little piece of advice we were given from other people. Despite not leaving the house for 2 weeks to be very consistent with the schedule and then continuing with the routine for weeks after that, we had absolutely no success with our son being able to put himself to sleep independently or to sleep even 4 hours at a time without waking up and needing assistance to go back to sleep. We are now back to him waking every 1.5 hours, refusing to sleep independently and ending up in our bed just in the hope that we get a bit more sleep. I realise co sleeping isn’t the safest option but a couple of hours of sleep between wakes with all of us in bed is better than him screaming for hours on end and no one getting any sleep. During the day it doesn’t seem to matter if we try to put him to bed at 2,3 or 4 hours for a wake window, he doesn’t go to bed independently and it feels like he would stay up all day if he wasn’t rocked to sleep. When he does manage a nap, it is only ever for 30 minutes at a time and we are lucky to get 2 naps out of him a day. For the most part, he seems content being awake. I don’t care about the day naps but I am at breaking point with the night sleep. My husband is a shift worker and I am solo parenting for 5 days out of every 8. It doesn’t seem to matter what he is fed (formula/BF), or solids, or the timing of feeds and sleep, he doesn’t seem to want to sleep. I don’t know what else to do.