Is it fair I have to sleep next to to kid and mom doesn’t

I take care of this 5 year old at the beginning he would fall asleep within 20 minutes but not it takes him an hour or 1.5 and last time it was 3 hours. His mom told she sits on the couch and he falls asleep alone in his bed. He pops out and talks to her and she says it can take a while. But at least she’s outside. Do you know how boring it is to be next to a child pretending to fall asleep for 3 hours I swear I was going to loose it. I tried hearing a show with my AirPods without showing my screen or music but yeah it’s getting to me. It’s just date nights but I feel like 3 hours is crazy. He told me babysitter have to stay in the room with him and the mom did say if I felt comfortable laying next to him to sleep. I think have two different expectations is part of the problem. I get at the beginning it was because I was new and he was scared but I have been going for 5 months now at least twice a month. I have stayed overnight and slept next to him and that’s fine with me but I don’t know. He lays down next to me and talks I tell him we need to sleep after a while of taking. I ask if he needs to go to the bathroom but I notice he just delays his sleep on purpose like he could just fall asleep when he decides to. Last time he said I waiting up for my mom when I told him she will be gone until way later he gave up that idea and fell asleep. I also notice he still drinks a bottle which may be part of the problem he falls asleep with it in his mouth. Most of the time I notice that he falls asleep after we do a snack. And he says okay this time for real. He doesn’t like the noises that happen in his house so I try using Spotify to play lullabies. I don’t mind being in the room for an hour pretending to sleep but 3 got me.