I have NSIP and was diagnosed at Mayo in June 2023. I am taking 10 mg of Prednisone and 2000 mg of Cellcept daily. I too am pretty tired by 2-3 pm. I am 70 years old and have been active with work and moderate exercise for years. I understand that some of the tiredness comes from medication. Some days my back hurts so much it’s hard for me to stand for longer than 5-10 minutes. Also, the weather affects lots of people with PF. Especially sudden changes. I walk in my house daily as my allergies can be a problem outside. Also do breathing exercises and light weights most days. Haven’t tried pulmonary rehab yet due to my meds causing immune suppression and don’t want to get sick. I hope 5his helps. Blessings 🙏