In the night, Ты can hear some footsteps outside your window. или Ты probably will hear some knocks on your window. But if Ты really want to know if he's visiting Ты или not, Ты can just put a цветок Далее to your window. And make sure the window is unlocked and not closed to thigtly. If Ты wake up in the morning and the Цветы are still fresh, then Peter has come in the evening to replace the flowers. Try to put the Цветы Ты put are roses. But if the цветок withers, don't give up. Keep believing and don't lose hope :)