Hey. Given that if you measure the energy of a wave function, the wave function must collapse to the eigenstate corresponding to the eigenvalue measured. Does that mean when you measure the energy of a wave function it must collapse the wave function into one of these stationary states? But then the thing is, if you collapse the wave function to this stationary state, well this stationary state doesn't really do much apart from spin around and oscillate in real and complex space, so would that mean that the wave function is now forever going to be in this stationary state? Thanks.