Little note : every sentence here it's always a thought.
Po is a Panda, he loves to sleep, he can't control it, that's why it never happens that he wakes up during the night.
He usually falls asleep and continues to do that until Tigress doesn't come in and shouts to him to get up. That night he wakes up and he wasn't able to fall asleep anymore…something weird is going on.
"Maybe i just need to get something to drink" He mumbles half asleep.
Po as soon as he goes outside his room and walks into the hallway the wood-planks under his feet starts to squeaking, that annoying sound widens his eyes and he wakes him up completely.
"I hope nobody will hear that…" then he starts to put his feet slowly one after one, but that won't make things better, the plank's creaking was still there, louder and annoying.
"That's why i can't walk out of my room in the middle of the night, maybe i should just go back into my room…" Po turns around and walks on the same poor wood-plank, but this time it can't handle his weight anymore, it breaks completely, the Panda trips inside of it laying right in front of Tigress's room.
"I should check if i wake her up, i messed up again, IN THE MIDDLE OF THE NIGHT!" He stands up again and slides the door to her room.
She was snoring on the bed, Po does a sigh of relief, she was still sleeping.
"Okay i should let her sleep." Then he closes the door again, but not entirely, he leaves a little gap where he peeks inside, he doesn't know why, but staying there, watching over her, makes him feel better and more relaxed then going to actually sleep.
Tigress starts to move inside her bed and Po panics thinking that he wakes her up, he slowly walks backwards falling again in that hole he made before and runs away forgetting completely about the loudly noises.
"Okay i did enough for all the nights in my entire life, let's go back to the usual night routine" he finally falls asleep.
Tigress instead considers it like a merely necessity, she doesn't sleep that much like Po and she wakes up several times during the night, what she does when she wakes up? You probably know.
"I feel cold, what's wrong with me in the middle of the night…" She thinks, stands up and finds her door open a bit, that's where the wind comes from.
"Wait…i remember clearly that i closed it before…" Po forgets to close it when he runs away and now she goes outside in the hallway to check for clues.
She walks in the hallway and finds the hole made by Po there's no mistakes only the Panda could've done that. Something happened to him? She seems worried, he never wakes up during the night.
"I watch over you every night, did you find out?!" She thinks scared. Tigress opens Po's door but she did it with too much strength and makes a loud sound. Po was there snoring, she wasn't even worried about waking him up, that Panda was unwakeable.
"He's sleeping maybe it wasn't him…but it's impossible nobody else is heavy enough to break it…." She sits on the floor and starts to do what she does every-time she can't sleep. Tigress simply stares at him, contemplating how easy and simple everything seems when he does it. Everything with a big, giant smile, even his snoring seems to be like a little happy song. She curls up into a ball, puts her head above her legs and watches, that helps her thinking and getting away from the reality. Is she imagining something with Po? Who knows.