Spending too much time with SO??

I'm with my boyfriend everyday. We go to sleep together and we wake up together. I go to school from 8:30-12:30 and I intern from 1:30-5:30 (sometimes 4:30) His work schedule depends on what time he goes in. Usually 9:00-6:30/7:00. Lately I've been feeling like we've been spending to much time together. Lately I've been getting so aggravated and annoying at the smallest things that he does and I don't know why but I feel like it has to due to spending to much time together because like I said we're ALWAYS together. We aren't fighting or anything. We're great I just haven't been feeling myself lately and I want to talk to him about it but I don't know how.