TKR-5 Weeks Post-Op-Back Pain

I am a new member and I am 4.5 weeks post-op TKR. For the most part I am walking 3/4-1 mile day. I was at 120 degrees last week. I am not experiencing much swelling. My knee still feels very tight (more so in the morning). Is this normal? Also, I am having a very challenging time sleeping. I just can’t find a comfortable position so I am not sleeping very well. Any suggestions? Thank you.