<human>: I get this isn't a huge issue but it does really hamper things. My SO and I have been together 4 years. He has great hygiene and is actually extremely obsessive when it comes to it. However, I noticed in the past few months or so, probably closer to a year, that he really smells when we're in bed for the night. To sleep, not have sex. When we get in to when we wake up. All night he smells. It's mostly his breath but it might be body, too. He doesn't smell at all during the day besides after eating onions or something or working out. For whatever reason, when we get into bed at night he just stinks. It's his general smell, not just coming from his mouth. It just smells very, very sour. It's difficult to explain. I don't understand this because he showers right before bed and brushes his teeth. He even puts on deodorant before getting in. He has an extensive routine! He flosses, brushes, uses a tongue scraper, and gargles using mouthwash. He uses a good soap to shower with, too.

I tried approaching this with him twice. I told him "I am not trying to hurt your feelings but I noticed that you have a weird odor when we're sleeping". He became really annoyed saying that I don't smell like flowers either. I'm not saying I do! However, I don't think he quite understands that it seems like an issue. Like a health issue? I don't know. He does have some "back-ne" or acne on his back but I don't see how that would cause this. When he gets up and goes down for breakfast, it's gone and he doesn't even change. The sheets are clean. I wash them once a week. I don't know how to approach this again. I've been using pillows to kind of block away the smell and that works okay. I want to help him figure this out but I guess he doesn't want to fix it.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Boyfriend smells only when we're in bed for the night. He gets offended when I try to talk to him about it.