Why does my nose get stuffed up when I’m tired?

So my best friend and I were talking and we were both up super late. I was getting extremely tired to where my eyes were having a hard time staying open. We both noticed that when I get that tired, my nose gets super stuffed up and I start sniffling like I have a cold or something. No one else we know has that... show more So my best friend and I were talking and we were both up super late. I was getting extremely tired to where my eyes were having a hard time staying open. We both noticed that when I get that tired, my nose gets super stuffed up and I start sniffling like I have a cold or something. No one else we know has that issue, just me. Can anyone explain to me or have any suggestions why this happens?
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