I kinda have a question about my day, not really sure how to feel about it.

So tonight I had a dream with my SP. The only things I can remember is him asking me why I am still sad as it has been some time since we separated and him saying he loves me( but in sense that even though due to our circumstances we aren't together he still loves me) . I don't usually remember my dreams, but I decided to focus on the loving bit of the dream. Anyway as the day goes on, I was looking for my passport as travelling in two days (I never lose my passport) but I kind of did this time. By looking for the passport I stubbled across my memory box, which also contains bits and bobs from my SP. I didn't have a courage to go through these things yet, in order to keep positive thinking but this time I felt like I need to open it. So I did, and except others I found a letter where he is saying to himself to never let me go, because he is sure that I am his future wife... Anyway I took this as a bridge of incidents for my own positive thinking as I have never ever had to look for my passport before, there is thousands of things in the box and I opened exactly the letter where he calls me his future wife etc.. However.. I don't really even know how to describe this, but I am so exhausted. Not drained. I am happy and I feel calm inside but super super sleepy which started literally after I put the box away. Anybody with a similar experience of being super sleepy after some sort of reassurence?