concern???

boyfriend works all day so we don’t normally talk until he’s on his way home and then will call right before he goes to sleep and gets in bed, I had called him and he was like i’ll call you in just a little bit and I said okay but like an hour had gone by so I just called real quick and he was like I was asleep? I feel stupid for getting upset about this but he never does that and always calls me before falling asleep it’s only happened once so I feel like it’s not much of a concern yet just didn’t know if it was something to get worked up over or not