Weaning off breast

I need to wean my 7 month old off of breastfeeding on a night because I'm due to go back to work and I work 12.5 hour shifts, so my husband is going to have to out baby to bed 3 nights a week with the bottle. We're really struggling with how to wean him off the boob, up until 2 weeks ago he breastfed to sleep every night. He now takes a bottle and falls asleep but wakes up after 30-49 minutes and won't go down again without the boob. Any advice on how to stop the comfort boobs for sleep would be amazing as I'm really struggling. He just screams and screams until I give him a boob and I can't cope