A pnimi prepares

The Frierdiker Rebbe defines a pnimi for us:

For a pnimi everything takes place in its appropriate time; he does nothing without preparation. For the prayer is preceded by the “before prayer.” This consists of immersion in Mikveh, and not only the immersion that is strictly required [due to a seminal emission], but even the immersion for the sake of increased purity [as advised by the Baal Shem Tov]. This in turn follows a healthy sleep, one which was preceded by the recitation of the Kerias Shema She’al HaMitoh, during which one must reach a decision that the following day will be different. Even when it comes to divine good one must adopt the approach that tomorrow must be different. After this preparation, one’s sleep is completely different, and his prayer is different.

Sefer HaSichos 5707, p. 99.