Experimental observations of the consequences of generation of excited states of self-trapped excitons in insulators such as alkali halides and alkaline earth fluorides are surveyed. Three types of excited states are distinguished: electron-excited and hole-excited states of self-trapped exciton and host-excited states bound by a self-trapped exciton. The most extensive studies have been carried out for electron-excited states, which are deexcited dominantly by nonradiative transitions. A few examples are given of the photoinduced transformation of an excited self-trapped exciton in these states to a Frenkel pair in alkali halides and alkaline earth fluorides. It is emphasized that under laser irradiation with subgap photon energies, the self-trapped excitons and the Frenkel pairs generated by multiphoton excitation act as a source of one-photon absorption.