My wife and I have similar situation- I am a short sleeper- go to bed late get up early after maybe 6 hours. She's someone that needs 8 hours of sleep at least - So sometimes she sleeps in our guest bedroom. It also has the advantage of being at the back side of the house whereas our master bedroom is in the front and we live on a very busy street so the car noise tends to disturb her

And I do sleep naked- I tend to toss and turn a bit and pajamas get all twisted and wake me up