AM Cas is a dwarf nova with a busy light curve. A typical dwarf nova might show outbursts of several magnitudes interspersed with occasional stretches of quiescence where it only varies by a magnitude at most. AM Cas is a little different in that it appears to be continuously variable, with nearly continuous variations of about a magnitude, interspersed with outbursts of perhaps two magnitudes. It was originally classified as a Z Camelopardalis variable, but despite having near continuous activity it doesn't seem to have the extended periods of standstill that mark the classical Z Cam stars. Like many other CVs, AM Cas has become less well-observed in recent years, making it harder to track behavior like what we see here.