Anyone else feel think its weird to see a party end?

I was at a good friends house party the other day. It was a great time from the time it started at 10 pm. As the night wore on I saw people slowly say their goodbyes and head home for various reasons. At about 4 am me and a few other people were all that remained. I usually do not stay for an entire party and have actually until this point never seen how one ends so it was a new and awkward experience. Another friend left, then I left but it felt really surreal. I mean it was not the cheery farewell I had expected.