As you get older you will visit the bathroom at more points during your sleep cycle verifying the continuing existence of the bathroom. This may have some connection with the Quantum Zeno effect.This morning I got up and went to the bathroom. I believe the bathroom did exist all over night as part of "external reality"; it did not "become real" by being observed or used in the morning. Newton's equations of motion, conservation of energy etc. describing or predicting the continuously existence of the bathroom, and the bathroom itself have - for me - more than a pure epistemic meaning.